GENERAL SUMMARY. 205 



treatise than one exhaustive. Thus it may serve as 

 an invitation to country ramblers to pass into one of 

 the many comparatively untrodden paths of insect 

 research. New species will, doubtless, discover them- 

 selves to those who are not despisers of small things ; 

 and such forms will try their powers of discrimination 

 and comparison. 



I tender my thanks to many friends and corre- 

 spondents who have given me suggestions and help. 

 Amongst them I particularly name Prof. Rupert Jones, 

 who read my proofs on fossil Tettigidae ; to Mr. Leland, 

 Mr. Dakyns, Mr. Upcott, and to others who have not 

 been specially noted in my preface or text. 



An apology is due to the reader for my omission 

 of the Greek texts of some of the Anacreontic and 

 other poems in which the Cicada is lauded. Such 

 additions were contemplated in my Introduction, but 

 other matter has caused this volume to be sufficiently 

 bulky. 



Few chapters in Mr. Wallace's work on 'Darwinism' 

 will be read with greater interest than his last. The 

 question of the rise and development of organized 

 material forms, has not been restricted to the con- 

 sideration of snch forms but has already passed into 

 the far more difficult region of Psychology. This 

 certainly is not the place to enter on ground, thought 

 by many to be debatable ; but in passing by such 

 discussions, we may say that whilst energy is not 

 gross matter, so Will and Choice are not energy. 



In conclusion I quote the words of the Duke of 

 Argyll, which speak so hopefully of man's future, and 

 his possible attainments : * — 



"Nothing is more wonderful in the human mind than 

 that it is conscious of its own limitations. The bars 

 to our knowledge, against which we so often beat in 

 vain, are bars which could not be felt at all, unless 

 there were something in us which seeks a wider scope. 



'■= 'Contemporary Keview,' December, 1880. Duke of Argyll. 



