308 On Siberian Wheat,[Nov

Your readers are not informed respecting the state of the Jand; that of the preceding crop; nor whether the smutl- ted and clean crops were contiguous to, or at a distance from each otber. They are, however, informed that the piece which produced the Smutted corn“was Sheltered by a wood." Now, Sir, though I am a warm friend to experiments, and io the diffusion of agricultural facts, I am So thoroughly convinced that a considerable difference in the produce tfre- quently arises from a minute difference in culture, manure, aspect, exposure,&c.&c. that I cannot deem the result of any comparative trial, where there is the Smallest differ- ence in these respects, worthy of much attention. And as the“ Shelter of the wood" materially varies the circum- Stances under which the crops were raised, 1 contend that a just conclusion cannot be drawn from Lhis experiment.

I grant that this objection might have been urged with greater force upon the hypothesis hat Smut 18 occasioned by atmospheric influence. 1 maintain, however, that the ma- nagement related by Clericus et Colonus was not a fair com» Parative trial.

If it would be admitted as an accurate experiment, Some would conclude that the above“ curious" method of pre- Paring Seed wheat, proved detrimental to the crop. And as the most determined enemies of pickling have not pretended thatit is injurious to the produce of our fields, there is ground to Sus pect Ihatthis“ curious" is different from the common mode.

It is certain that in the animal kingdom, and in the vege- table also, 5ome materials are highly beneficial in the cure of digeases, while olhers are either useless or hurtful. 1 may go a Step farther, and assert that Success and failureare Sometimes attributable to the different states of the Same remedial ingre- dients, or to the various modes of application,[ Should there- fore be glad if C/ericus et Colonus, would favour me with a full and minnte account of his friend's method of preparing rhe zeed wheat in question.

Perhaps you?ll deem this letter already too long; I must beg your permission, however, to offer a few remarks on blight, mildew and rust, diseases which[ consider as SOme- what different from each other, ihough Mr. Lawrence, your correspondent R. W. and Sir Jogzeph Banks, Seem to use these terms as different names of the zame malady. At present, hewever,[I Shall follow these gentlemen, and use their 8ynonyma of blight, rust, or mildew.

Mr. Lawrence, 1 think, calls the black spots(the rust, or fungi) upon the Slraw, the eztravaSSated juice af the marbid