Vlll PREFACE. 



tissues and structures, and this opinion induced him to make 

 the experiment : how far it is successful, he leaves others to 

 determine. He ventures to presume that, in the delineation 

 of nerves, there can be no doubt, as they are always eminently 

 white ; and such is their extreme delicacy in the lower ani- 

 mals, that justice could not be done to them by the adoption 

 of any other method. 



In the list of engravings, the word " Original " very fre- 

 quently occurs ; it is not intended to imply that such illustra- 

 tions have not been published before, but simply to indicate 

 that the drawings have been made from preparations dissected 

 by the Author, and to be found, either in the Museum of the 

 Koyal College of Surgeons, or forming a portion of his pri- 

 vate collection. He is quite aware, however, that a great 

 proportion of them are not only original, but unique, and 

 have not been published before. 



Finally, should the perusal of this book impart to its 

 readers only a tithe of the pleasure the Author has had in its 

 production, they and he will be alike repaid. 



DHTBOIT, MICHIGAN, February, 1858. 



