433 



placed on the edge of the large flat cork and fastened there with long 

 slender nails so that the circumference was divided into three. 



Additional slender nails were shoved into the top of this cork to 

 hold the bottomless bottle in position over the atmometer. In this 

 manner, units for measuring evaporation and controlling the conditions 



Fig. 34. Showing the arrangement of the bottle, thermometer, larva holder, 

 and atmometer used in the experiments on the codling-moth larvae and pupae. 

 In some cases egg-bearing leaves were fastened to the larva containers. 



of the air surrounding the larvae were made up in numbers and used in 

 all experiments in which the rate of evaporation is given. A number of 

 experiments were made with lai-vae in the celluloid-fronted cases already 

 described. When a saturated atmosphere was desired, they were dropped 

 into a bottle which contained an open vial of distilled water. Evapora- 



