94 



Artificial Incubation. 



[may, 



November and December. In Table III. it will be observed that 

 the percentage of fertility was very low in December, 1904, and 

 January, 1905, but high in November, 1904. In fact, it is 

 generally evident that with increased percentage of fertility the 

 ratio of hatching decreases, due to the egg chambers having a 

 larger number of eggs therein. 



is, * 



'ys . - 





/90s. 





Uf Ovy'. fyb/ GcJ. Jas>-. ~^k& %^cA 





"... " /\ 



/ 



/ "V ' ■ \ 



. Diagram II. — Monthly Percentages of Fertile Eggs Hatched. 



W The variations in the percentage of eggs hatched by the 

 different classes of machines as given below are interesting, 

 and may in some cases be capable of explanation, but they are 

 stated as they occur. 



I Table IV.— Highest and Lowest Percentages for 



each Month. 



Month. 



Class of 

 Machine. 



Highest 

 Hatching 

 Percentages. 



Class of 

 Machine. 



Lowest 

 Hatching 

 Percentages. 



1904. 











7 April 



B 



83-03 



B 



56-52 



'May 



A 



84*52 



C 



59-44 



June 



A 



83-10 



B 



65-0 



August 



A 



8977 



A & B 



75 -o 



September 





8977 



B 



61-29 



October ... 



B 



96-82 



C 



' 7174 



November 



C 



8 7 -5 



B 



73-68 



December 



C 



86-05 



A 



75-47 



1905. 











January 



A 



94-28 



A 



63-41 



February 



A 



83-33 



C 



67-97 



March 



C 



81 -5 



C 



60-95 



