During the whole of his tour through France, he visited the gardens everywhere, and made memoranda of everything that he thought would be useful for his intended work. He also made sketches of all the principal places, as he had previously done in the North of Europe.

Before leaving Genoa, he procured a collection of orange-trees, which he sent to England for his greenhouse at Bays water. He also saw, for the first time, slate boxes used for orange-trees, in the garden of Signore di Negye, near Genoa. In this city, also, he first met with his friend, Captain Mangles; and joining him and the late Captain Irby, they travelled together along the shores of the Mediterranean, leaving Genoa on the 6th of July, in a felucca, for Leghorn, where they arrived on the 8th, and thence proceeded through Pisa to Florence. During the whole of this tour, Mr. Loudon's Journal is entirely filled with descriptions of the gardens he visited, observations on the different modes of culture he saw practised, and various remarks on the habits of plants. One of the latter, which appears to me worth recording, is, that he found Saxifraga crassifolia killed by a very slight frost in Florence, though it will bear a considerable degree of cold in more northern climates. From Florence he went to Borne, and thence to Naples; after which he visited Pompeii and Herculaneum, returning through Rome to Florence, Venice, etc.

In these cities, he visited all that is generally considered worth, seeing, and, of course, did not neglect his favorite gardens.

As soon as he reached home, he began the Encyclopedia of Gardening, at which he worked, with little intermission, till it was finished, though he was suffering severely at the time from chronic rheumatism in his right arm; the pain from which became at length so intolerable, that, in 1820, he was compelled to call in medical aid; and, being recommended to try Mahomed's vapor baths, he went down to Brighton for that purpose. Here, notwithstanding the extreme torture he suffered from the shampooing and stretching, he submitted to both with so much patience, that they were continued by the operators till they actually broke his right arm so dose to the shoulder as to render it impossible to have it set in the usual manner, and, consequently, it never united properly, though he continued to use his hand to write with for several years.

In 1822 appeared the first edition of the Encyclopoedia of Gardening - a most laborious work, remarkable both for the immense mass of useful matter it contains, and for the then unusual circumstance of a great number of finished wood engravings being printed with the text instead of being in separate pages.. This book had an extraordinary sale, and fully established the literary fame of its author.

In the early part of the year 1823, he wrote a work entitled "The Different Modes of Cultivating the Pine-Apple, from its First Introduction to Europe to the Improvements of T. A. Knight, Esq., in 1822".

About this time, also, a little work was published anonymously, called The Greenhouse Companion, which, I believe, was written, either entirely or in part, by Mr. London: but it must have been by a wonderful exertion, if he did write it; as, during the whole of the year 1823, he suffered most excruciating pain, not only from his right arm, the bone of which had never properly united, and to retain which in its place he was compelled to wear an iron case night and day, but from the rheumatism which had settled in his left hand, and which contracted two of his fingers and his thumb, so as to render them useless. It is, however, worthy of remark, and quite characteristic of Mr. Loudon, that, at the very time he was suffering such acnte bodily pain, he formed the plan of his houses in Porchester Terrace, Bayswater, and superintended the building of them himself, rising at four o'clock every morning, that he might be on the spot when the workmen came.

In 1824, a second edition was published of the Encyclopoedia of Gardening, in which the work was nearly all rewritten, and very considerable additions were made to it. - In the following year, 1825, the Encyclopaedia of Agriculture was written and published. These extensive and.laborious works following closely upon each other, in Mr. Loudon's state of health, speak strongly as to his unparalleled energy of mind. When, shortly after, his right arm was broken a second time, and he was obliged to submit to amputation, though he gave up landscape-gardening, it was only to devote himself more assiduously to his pen. He was, however, now no longer able to write or draw himself, and he was compelled to employ both an amanuensis and a draughtsman. Still, though he had only the use of the third and little finger of his left hand, he would frequently take a pen or pencil, and make sketches with astonishing vigor, so as fully to explain to his draughtsman what he wished to be done.

During the time that he was suffering so severely from the pain in his arm, he found no ease but from taking laudanum; and he became at last so habituated to the use of this noxious potion, that he took a wineglassful every eight hours. After the amputation of his arm, however, he wished to leave off taking it, as he was aware of its injurious effects upon his general health; and he contrived to cure himself by putting a wineglassful of water into his quart bottle of laudanum every time he took out a wineglassful of the potion, so that the mixture became gradually weaker every day, till at last it was little more than water; and he found he had cured himself of this dangerous habit without experiencing any inconvenience.

In 1826, he established The Gardener's Magazine, the first periodical devoted exclusively to horticultural subjects. This work was always Mr. Loudon's favorite, and the organ through which he communicated his own thoughts and feelings to the public. It was originally undertaken principally for the benefit of gardeners in the country, in order to put them "on a footing with those about the metropolis;" but it soon became the universal means of communication among gardeners, and was of incalculable benefit to them. It also became a source of great pleasure to amateurs of gardening, and was, no doubt, the means of inspiring a taste for the pursuit in many who had before been indifferent to it. "In an art so universally practised as gardening, and one daily undergoing so much improvement," Mr. Loudon observes, "a great many occurrences must take place worthy of being recorded, not only for the entertainment of gardening readers, but for the instruction of practitioners in the art." That this work met the wants of a large class of readers, is evident from four thousand copies of the first number having been sold in a few days; and from the work having continued popular for nineteen years, and, in fact, till its close at the death of its conductor.

The Gardener's Magazine first appeared quarterly, afterwards it was published every two months, and finally every month. The second number of this work contained an attack on the London Horticultural Society, the affairs of which were then notoriously ill-managed, though, before the publication of The Gardener's Magazine, no one had ventured to complain of them publicly. In the same number appeared an article on the " Self-Education of Gardeners," in which Mr. Loudon began those earnest exhortations to gardeners to improve themselves, and those efforts to pnt them in the way of self-improvement, which he continued almost to the last hour of his life. He also, in this second number, gave a plan for the improvement of Kensington Gardens, and suggested the erection of "small stone lodges with fireplaces at the principal garden gates, for the comfort of the door-keepers in winter," as, before that time, the door-keepers had no shelter but the alcoves; and he proposed that at least once a week a band should play in the Gardens, and that the public should be able to obtain the convenience of seats, as in the public gardens on the Continent. In the third number of the Magazine, he began a series of articles on "Cottage Economy," and invited young architects to turn their thoughts to the election of cottages, as well for laborers as for gardeners, which should be not only ornamental enough to please the gentlemen on whose grounds they were to be erected, but comfortable to those who were to live in them.

These hints were followed up by many gentlemen: and I think I never saw Mr, Loudon more pleased than when a highly respectable gardener once told him that he was living in a new and most comfortable cottage, which his master had built for him - a noble marquess, who said that he should never have thought of it, but for the observations in Mr. Loudon's Gardener's Magazine, as they made him consider whether the cottage was comfortable or not, and that, as soon as he did so, he perceived its deficiencies. In the fourth number of the Gardener's Magazine, the subject of the reform of the Horticultural Society was resumed, and it was continued in the succeeding numbers till 1830, when the desired result was at length effected.

Both in the early volumes of the Gardener's Magazine and in the Encyclopaedia of Gardening, Mr. Loudon had strongly advocated the necessity of having garden libraries; and, in the second volume of the Gardener's Magazine, he gave a list of books he considered suitable for a garden library, in which he included the Encyclopaedia of Plants and the Hortus Britannicus - works then written, though they took so long in printing, that they were not published till two or three years afterwards. It is very gratifying to find that numerous garden librarics were established in different parts of the country, in the course of two or three months after they were first suggested in the Gardener's Magazine, and that several letters appeared, from working gardeners, on the advantages and improvement which they had received from the books they thus obtained access to.

(To be concluded).