254 BLOOD. 



sanguineous exudation in the abdominal cavity ; but after the 

 death of the animals, the gastric juice, bile, and all the other 

 secretions, were found to be extremely rich in ammoniacal salts. 

 Stannius has thus adduced the most certain proof, that, at all 

 events, the phenomena of uraemia cannot be dependent on the 

 mere retention of urea. Stannius moreover, totally denies the 

 possibility of the transmission of urea into the gastric juice ; while 

 I agree with Marchand,* and feel convinced that I have ascertained, 

 beyond doubt, the presence of this substance both in the contents 

 of the stomach and in the vomited matters of a dog whose kidneys 

 had been extirpated. 



The bile-pigment, biliary acids, and abnormal pigments which are 

 sometimes found in morbid blood, have not been quantitatively 

 determined. 



We have already endeavoured, in the above remarks, to review 

 the quantitative relations of the constituents of the blood under 

 their various external and internal conditions, and considered the 

 increase and decrease of each individual component part as far as 

 the investigations hitherto made allowed of the prosecution of such 

 an inquiry, this being the only method by which we could hope to 

 arrive at a more thorough insight into the metamorphoses of the 

 blood, and of animal matter generally. It is obvious that we 

 cannot hope to arrive at any definite conclusions regarding the 

 subject in its general bearings, until we have sufficiently examined 

 its individual features under all their different relations. Indeed, 

 the metamorphosis of matter in the blood is entirely comprised in 

 the different relations into which the constituents of the blood are 

 brought under different conditions either in respect to their 

 quantity or quality. We have, therefore, regarded it as more 

 rational and more favourable to the cause of science, to begin our 

 representation of the constitution of healthy and morbid blood, 

 according to the views laid down in p. 6, with a notice of its consti- 

 tuents that is to say, to consider the blood according to 

 chemical categories. In the meantime, we would hope that a short 

 exposition of the results of the analyses of the blood, which have 

 been conducted with reference both to physiology and pathology, 

 may alike tend to throw light upon the whole subject, and to 

 elucidate many physiological and pathological processes. Risking 

 the charge of repetition, we must observe that we purpose giving 

 a short notice of the differences in the constitution of the blood 

 in different physiological and pathological processes, by which 

 * Journ. f. prakt. Ch. Bd. 9, S. 499. 



