All these manifestations are more usually found near a bud or branch, a short crotch in a limb, or at the points where the bark is changing from smooth to rough, as if partial to places where there is some interruption of flow, or fulness of sap; though frequently on all parts of a peculiarly vigorous growing shoot or limb, where, indeed, the-conditions would be much the same.

Now that this is the cause, not the consequence, of the blight which appeared here last season, any man that has these eyes may see; and numbers of intelligent men have examined my trees, (of which I have several hundred,) with me, and all concur with mo in this opinion. But this blight bears no more analogy to the blight which I described a few years ago as the "sun-blight," than the worms which ate King Herod's bowels boar to a sodded leg - though a blight - that is death, came of both alike. I do not know that this instect and the consequent blight, has appeared anywhere else exeept here - if so, it hi now easily found, or at least traces of it. If not wait a little - don't complain - you knew nothing about pear blight from any other form of it. In the language of BURKE, " all the horrors of Might before known or heard of, were mercy to this new havoc".

Do yon ask why, if the cause is as above stated, what so appalling? Why not destroy the insect at once? Destroy htm! the villian!! Sweep down the stars - count out the sands rehearse all your arithmetic, make millions of billions your unit figure, and there begin your computation, and when you have thus trained your mind to the infinite in number, pray tell me how an insect that could tramp by the thousand through the very bones of your flesh, without disturbing your slumber, can be waylaid and destroyed? If the Infinite One does not work for us, with the periodical changes of all-devouring cold or beat, or those other means by which he checks the career of these infinitissima races, I confess I know not what can be done. What soap, ley, ashes, lime, copperas, sulphur, plaster, tobacco, spirits turpentine, salt, coal-tar, charcoal, assafoetada, and a whole apothecary shop of other drags can do, I have already tried upon them - and I despair - for unless the season should in some way, by its peculiarities, bring relief, I cannot believe after all my trouble, that my pear trees will one of them exist five years - if, indeed, one year hence, though to a careless observer, not a finer, thriftier lot of trees can be found in the country, than they now are; some shoots grew eight feet long last year, perfectly healthy and sound.

True, the washing with soap and tobacco water, and putting coal ashes around the roots, last August, invigorated the trees, and seemed to check the disease for the time, and has evidently kept the insect from depositing its eggs on the parts washed; but there was ground enough escaped the wash for more millions of eggs, now visible in their effects, than there are people on the globe; and what can I do - the covering of the eggs will not admit water or caustic, unless strong enough to the tree, I fear, and besides, who can wash all parts of a large tree all over. That peeling off the eggs, and a small slice of the bark, will stop it, I know by trial; but who can spend time to do it where it has got fairly hold, as it has with our trees here; and if one man does it, will his neighbors do the same. I see but these possible courses; either to throw something into the top of the tree, as salt water, or quick-lime when the dew is on, in fine powder, just as the insects are hatching out; or throwing something offensive into the circulation of the tree, by absorption at the root from the earth; or by a strong wash on the bark, and absorption from it, as of lime wash, or ley and tobacco water; or by boring and plugging some offensive substance in the trunk, as has been proposed for the curculio, with sulphur, spirits turpentine and lamp-black, will drive it away, if it can be used without killing the tree.

I have reason to believe that this insect commences its career at the collar or trunk of the tree, and passes through one of its stages or tranformations under or near the ground, as intimated by a lady not long since, in your paper; and that the phenomena above described, constitute a second, if not a third period of its history, after the manner of what are called the grand-nurses and nurses, of the microscopic tribes. But this I leave to those better versed in such matters than I can pretend to be; for in this infinitessimal world, I frankly confess I find myself an utter novice. I am even astonished at what my own eyes compel me to believe, and almost in despair at it too. Where is the end of this living dust to be found, in wheat-rust, yellows, grape-rot, and all similar things; if this is the way of this great, coarse, granite world of ours, when you come to sea its living atoms, as they are - small enough to gallop full tilt upon nothing - and still flunferous enough to eat up the solid globe itself?

The coarse holes or punctures above described, which are seen in the bark, are by no means made by the puncture of the insect. He has no occasion for any such chasms; but they are the result of the sloughing off of the poison he leaves wherever he goes, as you will soon see by cutting into one of them.

In conclusion, I would say that I have been advised by my friends to withhold the publication of these facts till I could take time to trace out thoroughly the history, changes, and remedies, for this fatal insect, whatever its name may be; though were I to christen it, I should call it the " Pear Devil"

I read the article of Mr. Allen, on pears, in your last number, with great interest, and I reflected that there was millions of dollars worth of valuable property, now in the process of destruction in the United States, as well as my own; and at the hazard of great mistakes, errors, and even of ridicule and contempt, in the present crude state of the inquiry, I have felt it my duty to testify as above, to what I have seen, and to turn all other eyes, at once, and without delay, to this larvae, while it may yet be seen, thinking that this course gave promise of more safety, and of a more extensive, prompt, and thorough investigation, than any one man, (especially one so busy as I am in other matters,) could possibly make alone. And at all risk of errors, I shall not hesitate to report progress from time time, for we need the million eyes here, instead of one pair; and if others find out and describe more accurately than I can now do, the nature and habits of this pest, (as they surely will,) no one will rejoice more than myself - -while I cannot but think that the public will respect my motive for publishing without delay, even after they have from a more thorough knowledge, corrected the errors which almost of necessity must lie latent in any statement made at this point of our research.