IS a EXPERIMENT STATION. [Jan. 



DEPARTMENT OF CHEMISTRY. 



J. B. LINDSEY. 



Each year it has seemed wise to make a brief statement of 

 the vrork in progress, usually under the following headings: — 



1. Research SectiOxN^. 



The study of the composition of butter fat, as affected by 

 food, breed, period of lactation and other factors, has been 

 continued under rather adverse conditions, due to changes in 

 staff which have necessitated several months of preliminary 

 training, with corresponding loss of time. 



The butter fat from two grade Holsteins and from two grade 

 Jersey cows on the same ration was examined during the early, 

 intermediate and late periods of lactation. During the present 

 season the butter fat of four grade Holstein cows, divided into 

 tv.o groups, is being studied. The first group receives a basal 

 ration, and the second a basal ration with the addition of 

 coconut fat, peanut oil, corn oil and soy bean oil. 



Numerous American dyes are being examined with a view 

 to securing an indicator applicable to the analysis of dark- 

 colored oils and fats and those containing aldehydes, for which 

 purpose phenolphthalein is poorly adapted. 



Additional work on insecticides, in co-operation with the 

 department of entomology, has been reported. The products 

 studied were dry calcium arsenate, dry magnesium arsenate 

 and dry lime-sulfur. A new Bordeaux-lead and several samples 

 of lime-sulfur have been tested. Numerous samples were 

 examined in cases of suspected arsenical poisoning, and two 

 lots of pears for residual arsenic from spraying. 



