POULTRY LABORATORY GUIDE 71 



their gain in weight, and compare with unaltered 

 cockerels of the same age. 



EXERCISE XXI 

 The Preservation of Eggs 



Secure four jars holding about two quarts 

 each; they may be of stoneware or glass. A 

 two-quart Mason glass jar with rubber seal is 

 excellent. Scald the vessels thoroughly with 

 boiling water. 



Place in each jar fifteen fresh-laid eggs, not 

 over one week old, which have been kept in a 

 cool place and washed clean. Number the jars 

 with printed labels one to four. 



Next prepare the following solutions : — 



No. I. Take one pint of water glass or silicate 

 of soda, and add to it nine pints of boiling water, 

 which makes approximately a ten per cent solu- 

 tion. Pour this solution of water glass over the 

 eggs .in jar number one until they are completely 

 covered, and seal the jar. 



No. II. Take one pound of quicklime and one 

 pound of table salt, and thoroughly mix them 

 with four quarts of boiling water. After slaking 

 and settling pour off the clear solution, and use 

 same to cover the eggs in jar number two. 



