PREFACE. 



A FEW of the Essays in this volume have been 

 pubhshed in serials. "Symbols of Psyche" originally- 

 appeared as an article in Tkc Sunday at Home. " Day- 

 flying Moths " and " The Case Moths," but for some 

 slight alterations, and some additions, have appeared 

 in Kuozulcdgc and Applctons Popular Science MontJdy, 

 and I have to thank the editors of those periodicals 

 for kind permission to reproduce them here. 



To Mr. W. F. Kirby and Mr. C. O. Waterhouse, of 

 the British Museum (Natural History), I must express 

 my thanks for the kindness with which they have 

 always helped me with the literature of the subject, 

 and have given me the free use of the valuable 

 collections under their charge. 



London, 



Dccanber, 1898. 



