In the year 1827, Mr. Loudon suggested the idea of planting some public walk according to the natural system, ana naming the trees in the way that has lately been done in Kensington Gardens. The same year, the first notices were inserted of horticultural societies offering premiums for the production of certain vegetables, flowers, and fruits - a plan which has since been carried to a very great extent.

In the year 1828, the Magazine of Natural History was begun, being the first work of its kind; and this work, though not quite so successful as the Gardener's Magazine, was very popular, and has had numerous imitators. Towards the close of this year, Mr. Loudon paid another visit to the Continent, to obtain information for a new' edition of the Encyclopaedia of Agriculture. After traversing France, he proceeded through Strasburg to Munich and Stuttgard; he afterwards visited Heidelberg and Carlsruhe, and returned by Metz to Paris, and thence to England. In the Gardener's Magazine for 1828, he began to give an account of this tour, and he continued it through several of the succeeding volumes, interspersing the descriptions of the various places he saw with a mass of valuable reflections on various subjects, which he conceived would be useful to gardeners. In the following year, 1829, he suggested the idea of having breathing zones, or unoccupied spaces half a mile broad, at different intervals around London; and, in the next article to this, he first suggested the idea of making use of the manure now carried to waste by the common sewers, a plan which has since engaged the attention of many talented persons.

Another plan suggested by him about this period, was for establishing national schools, or, as he termed them, parochial institutions for education. In the same volume, is a suggestion for the establishment of a gardeners' fund for the relief of the widows and families of deceased gardeners.

About this time, Mr. Loudon formed his first acquaintance with me. My father died in 1824, and finding, on the winding up of his affairs, that it would be necessary for me to do something for my support, I had written a strange, wild novel, called "The Mummy,"in which I had laid the scene in the twenty-second century, and attempted to predict the state of improvement to which this country might possibly arrive. Mr. Loudon chanced to see the review of this book in the Literary Gazette, and as, among other things, I had mentioned a steam-plongh, it attracted his attention, and he procured the work from a circulating library. He read it, and was so much pleased with it, that he published, in the Gardener's Magazine for 1828, a notice of it under the head of " Hints for Improvements;" and he had from that time a great desire to become acquainted with the author, whom he supposed to be a man. In February, 1830, Mr. Loudon chanced to mention this wish to a lady, a friend of his, who happened to be acquainted with me, and who immediately invited him to a party, where she promised him he should have the wished-for introduction.

It may be easily supposed that he was surprised to find the author of the book a woman; but I believe that, from that evening, he formed an attachment to me, and, in fact, we were married on the 14th of the following September.

Immediately after our marriage, Mr. Loudon began to rewrite the Encyclopaedia of Gardening, which was published in the course of the year 1831. On the 1st of October, 1830, he published the first part of a work, in atlas folio, entitled " Illustrations of Landscape Gardening and Garden Architecture;" but, from the very expensive nature of the work, and the limited number of subscribers, he found it necessary to discontinue it, and it did not proceed beyond the third part, which appeared in 1833. In the beginning of the year 1831, he had an application to lay out a botanic garden at Birmingham, and he agreed to do it merely on the payment of his expenses. On this occasion I accompanied him, and after spending about six weeks in Birmingham (which, though it is my native town, I had not seen for several years), we made a tour through the North of England, visiting the lakes in Cumberland and Westmoreland. It was at Chester that we saw a copy of Mr. Paxton's Horticultural Register, the first rival to the Gardener's Magazine, which, at the time we were married, produced 750 a year, but which gradually decreased from the appearance of the Horticultural Register till the period of Mr. Loudon's death, immediately after which it was given up.

After visiting the beautiful scenery in Westmoreland and Cumberland, we passed through Carlisle, and entered Scotland by way of Longtown and Langholme. It happened that there was a fair at the latter place, and the town was so exceedingly full that they not only could not give us a bed, but we could not even find a place to sit down. When we entered Ayrshire, the county to which Mr. Loudon's family originally belonged, he was received with public dinners at Ayr and Kilmarnock. A public dinner was also preparing for him at Glasgow; but while we were staying » at Crosslee Cottage, near Paisley, the residence of Archibald Woodhouse, Esq., one of his most highly esteemed friends, he received a letter from Bayswater, informing him of the severe illness of his mother, and her earnest wish to see him. Mr. London was warmly attached to his mother, and as, unfortunately, we did not receive the letter till late at night, for we had been dining in the neighborhood, we did.not go to bed, but packed up everything so as to be able to set off with daylight the next morning for Glasgow, where we left Mr. London's man with the horse and carriage, and proceeded to Edinburgh by coach, though we could only get outside places, and it rained; besides which, Mr. Loudon had never ridden on the outside of a coach since his knee had become stiff, and he could not ascend the ladder without the greatest difficulty.