LARKSPUR POISONING OF LIVE STOCK, 29 



in order to be present at the times when larkspur poisoning was 

 deemed most likely to occur. The location of the station was most 

 favorable, not only because of the abundance of larkspurs in the 

 immediate vicinity, but because it was located in the immediate 

 neighborhood of the summer ranges of the cattle, so that a most 

 intimate knowledge of range conditions could be gained. 



THE STATION AT GREYCLIFF. MONT. 



In 1912 and 1913 the field experimental work in poisonous plants 

 was carried on at Grey cliff, Mont. (PL VII, fig. 2). An old sheep- 

 shearing plant was loaned for the purpose by the owner, Ole Birke- 

 land, and the necessary repairs were provided by the Forest Service, 

 including fitting up the house for use as office, laboratory, and dining 

 hall, necessary repairs to the barn, and construction of fences and 

 corrals. 



While experimental work was to be undertaken on a number of 

 poisonous plants, this location was considered especially favorable 

 for the study of the effects of feeding Delphinium cucullatum and 

 Delphinium hicolor. The main industry in this region is sheep 

 grazing, and it was considered an especially favorable point to study 

 the effect of the Montana species of larkspur on sheep. Here, as in 

 Colorado, the stockmen of the neighborhood showed most helpful 

 interest in the work and assisted materially by loaning sheep and 

 cattle for experimental work. 



EXPERIMENTAL FEEDING OF DELPHINIUM BARBEYI TO CATTLE IN 1909. 



In 1909, 4:2 experiments were conducted of feeding DelphiniuTn 

 harheyi to cattle on 26 different animals. Table I gives a sum- 

 marized statement of these feeding experiments. The work was not 

 commenced until the last of June and definite results were not ob- 

 tained until the last of July. Of these 42 cases 22 were poisoned. 



As the season progressed it was evident that larger quantities of 

 the plants were necessary to produce toxic effects than had been 

 supposed at the beginning of the experiments, and this fact doubt- 

 less explains the failure to produce poisoning in the earlier experi- 

 ments. The summarized results in regard to symptoms and treat- 

 ment are given later in this paper. Following are a few typical 

 cases given in some detail. 



Case 92. 



This case was interesting as being the first one in which there 

 were definite symptoms of poisoning. Case 92 was a cow weighing 

 about 990 pounds which had been used for experimental purposes 

 with Delphinium Tnenziesii without any effect. On June 30 she 

 ate 30 pounds of leaves and stems of Delphinium, harheyi. On the 



