128 
The residual gas was found to consist of — 
Carbonic Oxide 
... 4-8 
per cent. 
Carburetted Hydrogen.... 
.. 2-5 
55 
Hydrogen 
.. 6-2 
55 
Nitrogen 
.. 86-5 
55 
100 - 
Where the sulphuretted hydrogen is 1*5, the sulphur is to 
the carbon as 1 to 24 ’8. 
Both the oxygen and carbon of the carbonic acid are derived 
from tbe blood, which is therefore carried rapidly away. 
The point of greatest importance was said, by the author, 
to be the separation of these substances, which do not seem 
to be pure gases, and which are entirely absorbed by alkalies, 
and partly by acids and metallic salts. The portion absorbed 
by acid salts was found to contain carbon and nitrogen, in the 
relation of 140 to 54, or as 100 to 38*5 ; but part of this was 
evidently as ammonia. In albumen it exists in the relation of 
100 to 28*9 The whole of the putrefactive matters were not 
removed by acids or by acid salts. When the carbonic acid 
and sulphuretted hydrogen are removed, the putrefactive 
matters still remain. These gases, therefore, are not the only 
substances to be feared. 
The condition in which these putrefactive bodies exist 
was then discussed. The Author believed that one of the 
conditions in which solid substances were taken into the air 
was in solution, the solution itself being taken up as a vesicle ; 
and he instanced analogous cases, such as sulphuric acid and 
zinc when hydrogen is forming. The liquid evaporates and 
a concrete globule forms, leaving at last a portion ot solid 
matter in various states. This condition can be supposed 
to occur readily in many cases, but it does not appear to be 
the probable result in all cases, as he cannot readily imagine 
vesicles coming through the close pores ot bodies such as are 
