AUTHOR^S PREFACE. 



The completion of the ' Chemistry of Man^ has been una- 

 voidably delayed beyond the time at which it was advertised 

 to appear, in consequence of the large number of original ana- 

 lyses that I found it requisite to institute. As, however, these 

 analyses materially increase the value of the work, I trust 

 that my apparent procrastination will be readily forgiven. 

 The present volumes comprise pln^siological and pathological 

 chemistry. They treat of the physical and chemical relations 

 of the fluid and solid portions of the human body in a state of 

 health, and of the modifications they experience in different dis- 

 eases. Moreover, in every instance, the chemical examination 

 of the fluids and solids of the lower animals is appended to 

 each chapter. The order in which the various matters treated 

 in these volumes are discussed must be regarded rather as natural 

 than physiological. After the circulating fluids, viz., the blood, 

 lymph, and chyle, with which I commence, — I treat of the 

 secreted and excreted fluids, as, for instance, those of the chy- 

 lopoietic system, of the female breast, of the mucous membranes 

 and skin, of the kidneys, &c. : next in order, I take the faeces 

 and vomited matters. I then consider the various tissues that 

 enter into the composition of the animal body, as, for instance, 

 the bones, muscles, skin, and glands ; and I conclude with a 

 description of various solid and fluid morbid products, such 



