Appendix. 



505 



B.— BENEFICIAL INSECTS. 



Little niitice has ))ecii diviwii to the many iiisei'ts wliich can only 

 be looked mion as beuefieia,! on account of tlieii' tendini;' to keeji down an 

 access of other in^i-ct Hfe. After nia.riy \-cars' o))sei'vations the \\riter is 

 iuchned tn belic\e that tliey ai-e quite cnnipetent to kec}) the balance of 

 Nature but are quite incompetent to I'cstofe that balance of Nature upset 

 by man. ( >ne or two cases of the benetit of such introduced " friends " are 

 knoNMi, such as the cushion scale and the Vedalia ladybird one hears so 

 much of, and which seems to have been nuide a juni]iinn--[)lauk' for anyone 

 to write and talk alxait. 



[F. Edenden. 



1, Si/rphiix rihexii 



ic. ;j2(;. — Ai'ijis DrsTKdVEus. 



Lailyliiid Kt^L-tle ; r,, C'ocr 



Some references have been made in this work to what Mr. Troggatt 

 and ilr. Lounsbury in their travels have seen of these wonders in other 

 countries, and this must surely settle the minds of any of the blind 

 followers of the wonderful powers of insect friends. As Mr. Froggatt 

 told me, when one wanted to see the working, for instance, of the intro- 

 duced Codling Moth parasite in California., they were unable to show it 

 him in the field. 



That come insects prey upon others, every grower knows. When his 

 fruit has been spoiled by aphis, and his hops blighted Ijy the same, swarms 



