C 90 D 
IV. Chemical Researches on the Blood , and some other Animal 
Fluids. By William Thomas Brande, Esq. F. R.S. Commu- 
nicated to the Society for the Improvement of Animal Chemistry , 
and by them to the Royal Society . 
Read November 21 , 1811. 
SECTION I. 
Introduction. 
In the following pages I shall have the honour of laying 
before this Society an account of some experiments upon the 
blood, which were originally undertaken with a view to ascer- 
tain the nature of its colouring matter. The difficulties atten- 
dant on the analysis of animal substances have rendered some 
of the results less decisive than I could have wished, but I 
trust that the general conclusions to which they lead, will be 
deemed of sufficient importance to occupy the time of this 
body. 
The existence of iron in the blood was first noticed by 
Menghini,* and its peculiar red colour has been more re- 
cently attributed to a combination of that metal with phos- 
phoric acid, by M. M. Fourcroy and VAUguELiN.'f The 
• Vincentius Menghinus de Ferrearum Particularum Progressu in Sanguinem. 
Comment. Acad. Bonon. T. z, P. 2, page 475. 
f Systeme des Conn. Chym. Vol. 8, p. 
