Feeding Experiments. 17 



to cause the death of animals, even when the screenings are fed 

 in moderate quantity.. 



Pammel, of Iowa, in his "Manual of Poisonous Plants" records 

 the opinion of Dr. Schaffner that the cause of death to cattle is 

 probably due to the prussic acid (hydrocyanic acid) envolvfed from 

 the plant when wilting! 



Feeding Experiments. 



During the winter of 1914-15 the Animal Husbandry Division 

 of the Central Experiinental Farm, Ottawa, conducted experiments 

 in the feeding of elevator screenings and their commercialseparations, 

 with milch cows, swine,^and lambs. 



THE MATERIAL. 



In securing material for the experiments, pains were taken to 

 get screenings representing as nearly as possible the average cleanings 

 taken from western grain. The following statement from Mr. F. 

 Symes, the inspector in charge of terminal elevators, explains how 

 the material used for these experiments was secured: — 



Fort William, Ont. 



February 6, 1915. 



J. R. Dymond, Esq., Seed Analyst, 

 Department of Agriculture, Ottawa. 



Dear Sir, — I beg to advise you the carload of screenings 

 which I obtained for the department was taken from the Port 

 Arthur elevator, Empire, Grand Trunk Pacific, and the 

 Dominion Government elevators at Port Arthur and Fort 

 William. This would represent screenings from each road, 

 namely, the Canadian Northern, Canadian Pacific, and 

 Grand Trunk Pacific railways, and would be as representative 

 a sample of the natural screenings from western points as 

 it would be possible to obtain. 



These screenings were not recleaned in any way, but 

 came straight from the cleaning machinery. It would be 

 impossible to get a more representative sample than that which 

 I obtained for you. 



Yours truly, 

 (Signed) F. Stmes, 



Inspector. 



These screenings were from the 1913 crop. The separations 

 were made at the elevator of the Ogilvie Flour Mills Co., Ltd., 

 at Fort William, by a screening separator of the type commonly 

 81902—3 



