PREFACE, 



THE greater part of my share of these Anatomical and Patho- 

 logical Observations will be already, to a certain extent, familiar 

 to those who attended my lectures, in the theatre of the Eoyal 

 College of Surgeons, in Summer 1842, and Winter 1842-3. 



The Memoir on the Secreting Structures is reprinted in a 

 modified form from the Transactions of the Royal Society of 

 Edinburgh for 1842, and that on the Intestinal Yilli from the 

 Edinburgh Philosophical Journal of the same year. Those on 

 the Placenta and Lymphatic Glands were read in the Royal 

 Society of Edinburgh in 1843, but were not submitted for 

 publication. Abstracts of some of the others have also appeared 

 from time to time in the reports of various Societies. 



The observations on the healthy Structure and Economy of 

 Bone are, with the exception of those on the contents of the 

 corpuscules, an abstract of my lectures on this subject in the 

 College of Surgeons in Winter 1842-3. I have considered this 

 explanation necessary, in consequence of the resemblance be- 

 tween certain parts of my description, and those in the admirable 

 chapter on the same subject in Todd and Bowman's Physiological 

 Anatomy, drawn up from the observations of Mr. Tomes. 



My brother has added some of his own zoological, anatomical, 

 and pathological observations, as confirmatory of the doctrines of 

 centres of Nutrition, and of Secretion. 



