46 N. H. AGR. EXPERIMENT STATION. [Bulletin 171 



order to favor hatching of any eggs deposited and development 

 of larvse. The varieties of apples used included Early Harvest, 

 Yellow Transparent, Spy and Baldwin. 



In Cage No. 1, 13 females and 12 males were released on June 



29, the day when they emerged. All died or disappeared by July 

 18. Meanwhile, however, two eggs had been laid in an Early 

 Harvest apple placed in the cage July 15 and removed July 19, 

 giving a minimum period of not exceeding twenty days. 



In Cage No. 2, 14 females and 12 males were released on 

 June 29, the day that they had emerged. The last of these 

 disappeared or died by July 18, but one egg was laid in an Early 

 Harvest apple placed in the cage July 6 and removed July 7, 

 and one egg each in two Early Harvests placed in the cage July 

 7, and removed July 8. The minimum period here established, 

 therefore, was not to exceed eight days. 



In Cage No. 3, 12 females and 9 males were released on June 



30, the day on which they had emerged. These flies had died 

 or disappeared by July 18. One egg had been laid in a Spy apple 

 placed in the cage July 3 and removed July 6, thus establishing 

 a minimum period not exceeding six days. 



In cage No. 4, 15 females and 9 males were released on June 

 30, the day on which they had emerged. These lived no longer 

 than those in the other three cages. One egg was laid in a Yellow 

 Transparent apple placed in this cage July 6 and removed July 

 10, giving a minimum period in this instance not exceeding 

 eleven days. 



At another point in the college orchard a large cage covered 

 with cheese-cloth was erected over a standard apple tree. This 

 cage measured 12 by 12 feet square, and 12 feet high. Twenty- 

 five females and 7 males were released in this cage June 28, 1911, 

 and were supplied with apples changed at frequent intervals, as 

 in the other cages already described. In spite of the elaborate 

 preparations the flies in this cage died or disappeared within three 

 weeks. Apparently no eggs were laid in the apples hung to the 

 tree in this cage. 



Experiments in 1913. In 1913, 5 rearing cages were set up 

 in the open-air insectary. Each cage was 12 by 12 inches 

 square, and 24 inches high, and each was placed on soil. The 

 frame-work and top of the cages was wood, the sides and back 



