In your July number, page 130 and 131, Mr. Editor, you have made a calculation of the number of sheep, and the quantity of wool obtained therefrom. The census of 1840 shows, say 20,000,000 in the United States. Of this number you estimate only 11,000,000 shorn sheep, yielding 24,500,000 lbs. of wool, and the lambs at 9,000,000.--With due deference to your superior opportunities for information, I beg leave to say that you are over estimating the number of lambs, for every practical wool-grower knows, that that proportion is too large--if you had said one third, you would have come nearer the truth. I think you are mistaken also that the census of 1840 included lambs, it was exclusive of lambs.(_a_) You are, however, perfectly safe in estimating the average weight of fleece in the United States at 21/4 lbs. This is certainly too low by one fourth of a pound.(_b_) In this region it exceeds 23/4 lbs. Then you say, that by producing a superior quality of wool, its value would be increased nine cents per pound; this certainly is attainable; but the way in which you propose to bring it about, namely, by crossing with the "Paular, or old-fashioned Merinos," you would not obtain that end, thousands of fine flocks would be reduced in quality.(_c_) In this section it would reduce the quality as much as you wish to improve it. Coarse sheep would be improved by the cross; but to apply it to all the sheep in the United States, as I understand you to say, you would find yourself very much mistaken in the result. I venture to say, that on the same quantity of feed, you can not increase the heft of fleece of a fine flock shearing from 23/4 to 3 lbs., by your cross up to 33/4 to 4 lbs. per head, and have the wool in equally good condition.(_d_) An increase of feed will do much toward increasing the heft of fleece. A few words more and I have done. Examiner, page 52, says: "As to Paular Bucks, it strikes me that you might, for any practical purpose, just as well have advised a cross of the fabulous Unicorn, for it would be just as easy to find the one as the other at the present time in the United States; for depend upon it, there is no such thing now existing, as _a Paular Buck_, nor _any thing deserving the name_ in the whole country." And you say that "there are still large and valuable flocks scattered over the country."(_e_) H. D. GROVE.