DEPARTMENT REPORTS. 63 



LEAF HOLLERS. 



Last season a bitter-nut tree, Carya aniara, near my house, >vas seriously 

 injured by the walnut leaf-roller, Phycita juglandis, Le Baron. This season 

 two trees were attacked ef|nally Ijad. Witli my fountain pump, I sprinkled one 

 of these trees, using a pailful of water, — about two gallons, — in which was mixed 

 a teaspoonful of Paris green. This tree was wholly freed of the evil, while the 

 other tree suffered greatly. 



ANSAVERING INQUIRIES. 



The past year has been no exception to the previous ones in the number of 

 inquiries which I have received pertaining to matters in my department. Ofteu 

 I receive five or six such letters by a single mail. Such letters I have always 

 answered promptly, but this adds very greatly to my labors. I tliink this work 

 should be continued, but if it continues to increase I can only perform it by 

 being relieved of otiier work. It seems to me that all teaching which I do out- 

 side my department, which has really scope for three professors, is a positive 

 injury to the College. 



LECTURES AND PAPERS. 



During the year I sent an elaborate paper, on marketing honey, to be read 

 before the National Bee-Keepers' Association. This was afterwards published 

 in a pamphlet. I also gave a lecture on the Phylloxera Vastatrix before the 

 Ohio Horticultural Society, one on the same topic before the Michigan Pomo- 

 logical Society. These lectures appear in the published reports of the above 

 named societies. At the Allegan meeting of the Michigan Pomological So- 

 ciety, I spoke on the leaf -rollers and the codling moth. I gave during our 

 winter vacation a course of ten lectures before the Michigan Female Seminary 

 at Kalamazoo, on Zoology. I attended and lectured before three institutes : 

 the Pav; Paw, SaginaAv, and Climax, and gave assistance to the very competent 

 local committee in the preparation for the Saginaw Institute. In May last I 

 spent some time, at the solicitation of Hon. AVm. L. Webber of the Flint and 

 Fere Marquette Railroad, in investigating the destructive pine-borers of our 

 Michiga)! pine forests. I prepared a fully illustrated article on the subject, 

 which was published in full in the Detroit Post and Tribune, Free Press, and 

 Lumberman's Gazette, and extensively copied in others of our State papers. 



MANUAL OF THE APIARY. 



The first edition of 3,000 copies of this work, issued two years ago, having 

 been exhausted, I have re-written, enlarged and copiously illustrated a second 

 edition which has been published by T. G. Newman & Son, of Chicago. 



The second 1,000 copies of the revised edition has already been issued, and 

 the third 1,000 is being issued, though the work was not published till June, 

 1878. 



I have been Superintendent of the College Sabbath School for the entire 

 year. A. J. COOK. 



Agricultural College, \ 

 Lmising, Midi., Aug. 31, 187S. \ 



