Grade. 

 Date.. 



EXERCISE 33 



THE HOME PRESERVATION OF EGGS IN WATER GLASS 



Object. To become familiar with the proper procedure incidental to 

 the preservation of fresh eggs for home use, by water glass or the sodium 

 silicate method; also to compare this method with any other preserving 

 methods which may be available at the time. 



Equipment. At least one hundred strictly fresh, new-laid, infertile eggs; 

 stone crocks holding from two to four gallons; clean water which has been 

 boiled and cooled; sodium silicate liquid, about one quart, depending upon 

 the number of eggs to be preserved; a candling device in order that the eggs 

 may be candled before preserving; about six fertile eggs to compare with 

 infertile eggs, after breaking, in order to detect the difference in appearance; 

 a supply of eggs previously preserved. 



Procedure. Step 1. Examine six infertile eggs after they have been 

 carefully broken into a small glass dish. Study the white spot on the yolk. Use 

 a hand lens, if possible. Make a similar study of six fertile eggs, and learn to 

 detect the difference between the two types of eggs. 



Step 2. Lay down in water glass at least one hundred fresh eggs which 

 have previously been candled and selected for cleanliness, for uniform size, 

 and for good shells. Follow in detail the instructions given on pages 441 and 

 442 in Productive Poultry Husbandry. 



Step 3. Study the appearance of eggs which have been preserved for a 

 considerable length of time and compare with a fresh egg. Observe the fol- 

 lowing: (a) Condition of the preserving liquid, including odor, color, density, 

 and height in the jar. 



(6). Appearance of eggs externally, whether slimy, coated, rough, or 

 smooth. 



(r). Candle test to determine size of air cell, and location of yolk, and 

 density of contents. 



(d). Carefully break a few eggs and note density, color, and odor of 



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