104 



HATCH EXPERIMENT STATION. 



[Jan. 



Weighing the Animals, 



The auimals were weighed before feeding in the afternoon 

 at the beginning and end of the experiment, and once a week 

 during its continuance. It is recognized that this was not 

 sufficient, and in experiments now being made the animals 

 are weighed for three successive days at the ]>eginning and 

 end of the experiment and the same number of times weekly 

 during its continuance. 



Care of the MiJTc. 



The milk was weighed at once after being drawn, on a 

 Chatillon balance sensitive to two ounces. Composite 

 samples were taken for five days of each week, the milk be- 

 ing preserved with the aid of bichromate of potash. In order 

 to secure an average sample, it was poured from one pail to 

 another three times, and then 10 c.c. removed with the aid 

 of a pipette, an exact amount being taken at every milking. 

 The glass jars containing the composite samples were kept 

 tightly covered, and were gently rotated each day, to prevent 

 any undue clotting of the cream. 



Testing the Millc. 



The tests Avere in all cases made in duplicate. The total 

 solids were made either by the sand method or by use of the 

 perforated disk filled with asbestos. The fat was determined 

 by the gravimetric method, and in case of Experiment II. 

 total nitrogen was estimated by the Kjeldahl method. 



Experiment I. 



