PREFACE. IX 



acknowledge the courteous permission of the Controller of 

 Her Majesty's Stationery Office to use the electros, several 

 of which were supplied gratuitously. To Dr George Eleming, 

 C.B., I am indebted most of all : thanks to his generosity, 

 many of the excellent electros of worms, mites, &c., from his 

 translation of Neumann's ' Parasitic Diseases of Animals,' have 

 been lent me for this book, and others he has allowed me to 

 reproduce ; but it is especially for the trouble he has taken in 

 revising the chapters on Worms, Embryology, and the parts 

 concerning domestic animals, that I owe him so many thanks. 

 His publishers, Messrs Baillifere, Tindall, & Cox, also readily 

 gave their consent to the free use of his figures, and I cannot 

 let this opportunity pass without expressing my thanks for 

 their great courtesy in this matter. Professor .Nicholson has 

 very kindly contributed a number of figures from his well- 

 known ' Manual of Zoology,' which greatly add to the value 

 of the work. I must also acknowledge Miss Ormerod's kind- 

 ness in allowing me the use of fig. 118, and for other advice 

 alwaj'S so readily given. I must also express my thanks to Sir 

 William Flower, K.C.B., the Trustees of the British Museum, 

 Professor Eitsema Bos, Professor A. D. Hall, and Professor 

 Adam Sedgwick, for either allowing their figures or those of 

 institutions they represent to be reproduced, or for lending 

 the blocks. Mr ,H. Cousins has kindly revised the part of 

 Appendix II. dealing with insecticides. 



Not only in England but also from abroad, especially from 

 America, have I received much courteous and valuable aid, 

 and to one and all I tender my many thanks. 



FRED. V. THEOBALD. 

 Wye, December 1898. 



J\''ote. — The figures so kindly lent, and those purchased from other 

 works, are here gratefully acknowledged, with sufficient clearness, I 

 trust, for every one's satisfaction : — 



From His Majesty's ' Stationery Office, by permission of the Con- 



