415 



aiul digested, and the co-cfUiciciits of dige.stibility arc stated in tables. 

 "The uiitiitive ratios cakudated from tlie actually digested nutrients 

 vary butsliglitly in the two rations, being 1 to 0.17 for the corn meal 

 and middlings, and 1 to 6.27 for the corn meal and skim-milk." 



Conclusions from the ExrERiMENT, Gr. H. Whitciier, B. S. 

 (p. 14). — Among the conclusions drawn by the author are the following: 



One liniulred pounds of digestible matter in the skiin-milk and corn-meal ration 

 were equal to 146.0 pounds in the corn-meal and middlings ration. 



The superiority of the skim-milk ration is due in part, doubtless, to its greater 

 digestibility; but still more, in my opinion, to the fact that there is less waste mat- 

 ter, that is,indigestible matter, to be carried through the system, and lothe noticea- 

 ble difference in tlie character of the dung. The pigs on mixed grain invariably 

 grew constipated, while those on skim-milk were not so affected. 



The cost of a pound of gain on skim-milk and corn meal was 3.6 cents; on mixed- 

 grain ration, .5.2 cents. 



Digestible dry matter required to produce 100 pounds of gain of live weight ou 

 skim-milk and corn meal, 231 pounds; on mixed grain, 334.5 pounds. 



New Jersey Stations, Bulletin No. 75, November 7, 1890 (pp. 34). 



Insecticides and how to apply them, J. B. Smith. — This (!on- 

 taius brief, popular accounts of the different stages of insects, the ways 

 in which they attack plants, methods for applying insecticides, and 

 various kinds of spraying machines. 



The preparation of a number of different kinds of insecticides is also 

 described and a record is given of experiments with some of these 

 insecticides by the author and others in 1890. Potash salts. — Kainit 

 (1 ounce to 1 pint of water) was effective against wire-worms, cabbage 

 maggots, and plant-lice, but not so against hairy caterpillars. Muriate 

 of potash was used with less success. Tobacco. — A decoction of tobacco 

 was successfully used for ffea beetles on potatoes, plant-lice on rose- 

 bushes and chrysanthemums, the wheat louse, the larva of the rose tor- 

 tricid, and the rose slug, but was not satisfactory as used for the larva 

 of the elm-leaf beetle, hairy caterpiller, rose-chafer, and striped beetle 

 on melon vines. "Nicotinia," a rather coarsely ground tobacco dust, 

 was ineffective when ai)plied on dry plants, but made a somewhat better 

 showing on moist i)lants. A ftnely ground tobacco dust prei)arcd by 

 the author was much more effective. The addition of carbolic acid to 

 the tobacco powders increased their efficiency fully 50 per cent. " X. O. 

 dust," which seems to be a mixture of tobacco, carbolic acid, and whit- 

 ing, was more effective than either of the other tobacco powders and is 

 considered hy the author fully equal to pyrethrum as a contact poison 

 to be aijplirjd dry. Owing to the difficulty of making the pow^ders adhere 

 they are not likely to prove as effectiv^e in ordinary fiekl use as they are 

 in experiments on a small scale. Tobacco dust \}\\t into the soil was 

 successfully used in 1890 by Dr. E. F. Smith as a remedy for the peach 

 louse. Napthaline. — Experiments with this substance for cabltage and 

 radish maggots, the rose chafer, and plant-lice, while inconclusive, led 



