1 8 VERNON L. KELLOGG. 



proportion not exceeding the normal reached the gray stage. In 

 several lots the proportion reaching the cherry (earlier) stage 

 was distinctly above the normal. In one lot two thirds of the 

 eggs reached the gray stage (probably a lot of Bagdad race eggs). 

 One fertilized lot was treated to see if the drying had any inju- 

 rious effect. Submitted to the dry air for thirty minutes this lot 

 developed normally and all but ten or twelve eggs (a normal 

 number) hatched. 



Treatment with Sunlight. — Two lots of unfertilized eggs put in 

 direct sunlight for one and two hours respectively (temperature 

 35 C). Ten eggs in each lot reached gray stage, a normal 

 number. 



Treatment by Friction. — Several lots rubbed with tooth brush, 

 not very hard. A small increase over normal average of gray 

 eggs, some of these grays persisting alive for nine months, i. e., 

 time for hatching, but none hatched. 



Treatment by Heat. — Lots heated in oven to various temper- 

 atures from 25 ° to 57 C. The higher temperatures caused death 

 of all eggs, as well as eggs of fertilized lots used as checks. No 

 increase, over normal average, of developing eggs, through use 

 of the non-fatal temperatures. 



Treatment by Phosphoric Pentoxide and Glacial Prosphoric 

 Acid. — Nine lots treated for from one half minute to one hour, 

 the acid applied in some cases as powder, in others as liquid solu- 

 tion. The records are of sufficient interest to give in detail. 



Lot 1 : Treatment one hour. Acid put on as powder. Lot 

 of sixty eggs. Treated June 6 (1906). 

 June 1 1, three gray eggs. 

 June 21, six gray eggs. 



August 28, twenty-one or more cherry and gray eggs, of 

 which three are alive, others dead. 

 Lot 2 : Treatment, one hour. Acid put on as powder. Lot 

 of one hundred eggs. Treated June 6 (1906). 

 June 1 1 , seven gray eggs. 

 June 21, seven gray eggs. 



August 28, thirty cherry and gray eggs (one half are gray), 

 but all are dead. 

 Lot 3 : Treatment, one hour. Acid put on as powder. Lot 

 of seventy -five eggs. Treated June 6 (1906). 



