We have devoted enough space to a writer, who finds it so easy to tear down, but is never able to build up, a doubting Thomas, whose only mode of judging a cow, he says is a crumple horn, a large udder, and to test the milk every Monday for one year. What an amount of money the farmers of America would lose annually if they followed his rules, and what an amount they would save by following Guenon’s rules! The following valuable essay is from the _Country Gentleman_ of August 7, 1879: Contested Dairy Questions. By D. E. SALMON, _D. V. M._ Several of our prominent dairy writers have been lately discussing the more complicated questions of their department in a very energetic and decided, if not in a scrupulously exact manner. Now, if these questions are worth the time and space necessary for their presentation at length, they are certainly of sufficient importance to receive candid and perfectly truthful treatment; and, though these writers may not have intended to give wrong impressions, their teachings can hardly be considered, in several respects, as representing the present condition of knowledge on these points. MAGNE’S THEORY OF THE ESCUTCHEON.—In Mr. Eastburn Reeder’s essay on the escutcheon—which is a valuable paper, though marred in the above respects—there is an attempt at scientific argument in order to ridicule the accepted value of the milk-mirror; and the assumed facts on which this argument is based, are presented in such a positive manner that they will probably be accepted, without further investigation, by the majority of readers unless contested at once. The writer has hesitated to do this in the hope that it would be done by some one else; but the truth is of too much consequence to allow the matter to pass entirely without notice. The first point to which I will call attention is the attempt to dispute Magne’s opinion that the hair turns in the direction in which the arteries ramify, and that the reversed hair on the udder and adjacent parts indicates the termination of the arteries which supply the udder with blood. When these arteries are large, he holds, they extend through the udder upward and onward, ramifying on the skin beyond the udder, and giving the hair the peculiar appearance which distinguishes it from the rest of the surface. If these arteries are very small, they are not likely to extend much beyond the udder, and, hence, form a small escutcheon; consequently, a small escutcheon indicates a feeble supply of blood, and little material to make milk of.