84 Caterpillars on Oak 



trees could be sprayed in England as elsewhere, and that the cost was 

 not excessive. For approximately 400 trees, 1700 gallons were used 

 or 56 lbs. of lead chromate paste. 



Our thanks are due to Messrs Merryweather who provided the 

 machinery and ladders ; their apparatus worked admirably, even though 

 we had hundreds of yards of main, branch and rubber pipes out at a 

 time : the whole work was done by students except the actual control 

 of the petrol-driven motor. The illustrations attached speak for them- 

 selves. 



To the courtesy of the Office of Works, we owe the opportunity 

 to make this experiment; it is unfortunate that no result was obtained. 

 H. M. Lefroy.] 



