A. ?T. Lees :}63 



coat with dilute hydrochloric acid many were found in a dried up 

 state in the egg which had not hatched. Others remained fresh and 

 juicy within the unhatched egg. They appeared normal but failed 

 to hold later on. Only a few eggs had hatched and of these only two 

 had succeeded in reaching the open bud. 



(2) None were found in the buds. On dissolving the lime coat 

 by dilute hydrochloric acid many larvae were found to be unhatched 

 but dried up. Others had hatched but had failed to get more than 

 a little way out of the egg shell. Others had succeeded in escaping 

 from the egg but had been killed while traversing the lime coat. Newly 

 hatched larvae placed on a lime-coated slide become completely covered 

 with lime and usually die in about two hours, during which time they 

 only crawl a very short distance. 



In a second twig coated with (2) larvae were found fairly abundantly 

 in the buds. In both twigs no fresh apparently normal eggs were 

 found as was the case in the whiting coated twig, and in both cases, 

 on solution of the lime coat, dried up larvae were found in the resultant 

 solution showing that they were actually present, held immovably 

 under it. 



(3) Some were found in the buds. Lime flakings treated with 

 dilute acid showed presence of larvae. On treatment with acid the 

 shoot showed large numbers of hatched eggs, also of larvae dried in 

 the egg shell. 



(4) Practically none in the buds. After solution of the lime 

 by acid many hatched eggs were found and a few larvae dried in the 

 egg shell. As in all the limed twigs living larvae were found crawling 

 on the lime. 



From these experiments it appears that: 



(1) A thick covering largely prevented the appearance of larvae 

 in the buds. 



(2) The lime coatings largely prevented rupture of the egg shell 

 and where rupture had taken place many had not succeeded in getting 

 out of the shell, 



(3) Of those that had, many did not succeed in getting to the 

 surface. 



(4) Of those that had succeeded in getting to the surface a good 

 proportion were killed by the powdery hme adhering to their bodies. 



(5) The whiting coat almost entirely prevented hatching but did 

 not have such a desiccating action. 



(6) Under laboratory conditions a thin wash as lime one to water 



