Vlll PREFACE. 



Huxley, who kindly made some valuable criticisms 

 on reading my proofs on the ' Morphology and 

 Reproduction of Aphis ; ' and also to Prof. Thomas 

 Wiltshire and Prof. Rupert Jones, both of whom have 

 suggestively helped me to get all my four volumes 

 through the press. 



The subscripture to the Greek verse on my title 

 page is very obscure : and it will invite and test the 

 ingenuity of many, as to whether the author be ancient 

 or modern. 



Recently I have received from an anonymous writer, 

 who shrouds himself in euphonious but somewhat 

 " stiff " Greek, a witty suggestion as to the vexed 

 derivation of Linneus' word Aphis. It may be fairly 

 inferred that both these effusions are the product of 

 the same, or of kindred spirits. 



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