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PREFACE. 
Although the Lectures contained in the following 
pages have already appeared in the “ Medical Times” 
for 1851, it has been thought advisable to publish 
them in a separate form, and for this purpose they 
have been carefully revised, and a considerable amount 
of new matter has been added. 
The last two Lectures have been omitted in this 
volume, but will be included in a subsequent one, as 
they relate to the Structure of the Skeleton of Inver- 
tebrate Animals, which formed the subject of the 
Course of Lectures for 1851 — 52. 
The preparations exhibited, were, with few excep- 
tions, those described in the first volume of the 
Histological Catalogue, to which work the Author 
would refer those of his readers, who may be desirous 
of having a more detailed account of the individual 
specimens. 
The Author begs to tender his best thanks to his 
friend, Dr. P. R Ayres, for much valuable assistance 
during the progress of the work. 
32 , BLANDEQRD SQUARE, 
APRIL 27 , 1852 . 
