6"4 HORTICULTURAL MEMOIRS. 



III. 



On IPire-Grates, as a means of preventing Wasps 

 from entering Hot -houses. 



By Mr JOHN MACHRAY, Errol. 



(Read 13th December 1814J 



1 HERE are few avocations in life which require 

 more attention to a diversity of objects than that 

 of a gardener. 



After having, with the greatest care and at- 

 tention, brought his trees to a bearing-state, he 

 is obliged to maintain a perpetual contest with 

 ignoble enemies : the feeble efforts of puny in- 

 sects are often to him the source of many painful 

 sensations. Taken singly, they may appear con- 

 temptible ; but numbers render them formidable. 

 Even the elements sometimes conspire to blast his 

 expectations. On the one hand, he sees aphides 

 in numberless myriads roll up the tender foliage 

 of the peach ; the coccus preys upon the bark j 



