PKEFACE. vil 



mission of the Controller of Her Majesty's Stationery Office to 

 use the electros, several of which were supplied gratuitously. To 

 Dr George Fleming, C.B., I am indelated 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 kindness 

 in allowing me the use of fig. 94, and for other advice always 

 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. 

 Wtb, December 1898. 



A^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 Her Majesty's Stationery Office, by permission of the Con- 

 troller, figs. 44, 59, 60, 71, 86, 87, 89, 99, 108, 111, 112, 114, 122, 



