28 



A BACTERIOLOGICAL STUDY OF EGGS. 



TABLE 11. "Light spot" eggs 1 frozen and examined at intervals from May 12, 1910, 



to Jan. 4, 1911. 



(Four dozen eggs received by a commercial firm.) 



1 In this grade were included all of the eggs that before the candle showed the beginning of spot develop- 

 ment which may have been a stuck spot, an embryo spot, blood ring, or a mold spot. 



Maximum average count 24, 000, 000 



Minimum average count 2, 750,000 



TABLE 12. ' ' Heavy spot " eggs 1 frozen and examined at intervals from May 12, 1910, to 



Mar. 29, 1911. 



(Seven dozen eggs received from the trade as discards.) 



1 In this grade is included all eggs showing a marked development of stuck, mold, embryo spots or blood 

 rings. 



Maximum average count 150, 000, 000 



Minimum average count 14, 000, 000 



TABLE 13. Eggs called "blood rings" 1 frozen and examined at intervals from May 12, 



1910, to Jan. 4, 1911. 



(Four dozen eggs received from the trade as discards from candling.) 



i These eggs showed the development of at least 3-day embryos; in no case were the embryos living; 

 therefore designated as blood rings. 



Maximum average count 2, 080, 000, 000 



mm average count 350,000,000 



