258 



cost of manufacture, freight, and commission is the same for high- 

 grade as for low-grade manures, and the hibor of the farmer is in- 

 creased as the grade of the goods decreases. 



BULLETIN No. 57, JULY 31. 1880. 



Experiments avitii different breeds of dairy cows, G. H. Cook, 

 LL. D. (pp. 2-8). — The board of managers of the Station appointed 

 a committee September 15, 1888, to arrange for a series of trials of 

 different breeds of dairy cows to determine the cost and value of the 

 l^roducts from each breed. Eequests were sent to cattle clubs in dif- 

 ferent j^arts of the country to co-operate with this committee by fur- 

 nishing representative animals for use in these experiments. Notice 

 Avas given that the breeds to be tested were Ayrshires, Guernseys, 

 Holstein-Friesians. Jerseys, and Shorthorns, and that three animals 

 of each breed would be selected. 



" For animals approved by the several clubs, the Station agreed to 

 l^ay $100 per head when safely deliA^ered at the Agricultural College 

 farm; to furnish proper shelter, food, and care; to make full and 

 accurate records and reports of all experiments made; and to give 

 ready and free access to the representatives of the clubs. The ex- 

 periments in feeding, milking, weighing, measuring, etc., will be 

 carried out on the farm of the Agricultural College, and the analvses 

 of the food and milk will be made at the laboratory of the Agricul- 

 tural Experiment Station, and they will probably extend over a 

 period of from two to four years." 



The clubs co-operating with the Station in these experiments are 

 Ayrshire Breeders' Association, Brandon, Vt. ; American Guernsey 

 Cattle Club, Farmington, Conn. ; Holstein-Friesian Association of 

 America, loAva City. loAva ; and American Shorthorn Breeders' Asso- 

 ciation, Chicago, Til. Animals assumed to be representative were 

 selected by committees from each of these clubs and the experiments 

 w^ere begun May 1, 1880. This bulletin contains a list of the cows, 

 with descriptions, and their record for May, June, and July, includ- 

 ing milk produced and weight of the cow at four different dates each 

 month, and the weight of food consumed. 



Bl'LLETIN No. ."iS. AUGUST .">. ISSO. 



Anauyses of incomplete fertilizers, G. H. Cook, LL. D. (pp. 

 3-11). — Analyses are giA'en in tabular form of sixty-seven samples 

 of incom])lete fertilizers, /. e., those containing but one or two of the 

 fertilizing ingredients, nitrogen, phosphoric acid, and potash. The 

 cost of nitrogen from nitrate of soda and sulphate of ammonia, and 

 of' potash from muriate and sulphate of potash, is found to be rea- 

 sonably uniform ; but in the case of phosphoric acid, from both bone- 

 black and South Carolina rock, a range is noted of nearly GO per 

 cent in prices at different points. The cost of potash from kainit 

 also shows a Avide variation. The folloAving statements l)ear upon 



