THE MONTHLY BULLETIN. 335 



April 8tli, or one month after tlie beginning of the experiment, one 

 moist chamber twig was cut and scales examined with the following 

 result : 



Moist chamber twig 



Number of scales examiued 221 



Percentage alive 14 



On April 15th the remaining moist chamber twig was cut and exam- 

 ined with the following result : 



Moist chamber Exposed spray Uiisprayed 



twig twig check 



Number of scales examined 89 82 372 



Percentage alive 4 89 79 



At this time the Isaria fungus was growing in patches on the twigs 

 and on some of the dead scales. 



Fig. 69. — Showing moist cliamber arranged on tree in tlie field, 

 explained in Experiment 4. (Original.) 



as 



Experiment No, 5, March 16, 1915. 



On this date the same experiment as Number 4 was repeated. At 

 this time the weather w^as very warm. Two moist chambers were estab- 

 lished and also two twigs sprayed and left unprotected by the moist 

 chamber. There were 72 per cent of the scales alive at the beginning 

 of the experiment. 



