Variation of Color in the Venous Blood of the Glands. 265 : 
shake; at the fifteenth the animal: was up again; and thus 102 minutes 
were used in the whole experiment—a length of time much beyond what 
the longest operations would require.” 
ssrs. Févre and Ozanam have respired the gas several times,—if not 
to the production of sleep, at least to feeling its first effects. They say its 
a taste is slightly pungent, and as agreeable as that of ether; it excites 
 galivation. They propose its adoption in surgical practice, as the least 
dangerous method, and as sufficiently efficacious. 
Variation of color in the venous blood of the glands.—Since the dis- 
covery of the circulation of the blood, it has been admitted that the blood 
of the arteries is red and that of the veins black, with this exception that 
‘it is the reverse for the arteries and pulmonary veins. is fact has 
the lungs. But it results from the researches of Prof. Claude Bernard 
that this statement cannot be accepted absolutely. This skilful observer 
has proved, through a great number of dissections of living subjects, and 
im a manner which leaves no room for doubt, that the blood contained in 
renal yeins is sometimes black and sometimes red, and that when it 
has the latter color, it is black in the inferior vena cava which receives the 
blood om the renal vein. 
This fact being established, he looked for an explanation, and found 
that it was due to the state of repose or activity of the kidneys, the 
| ‘Severity which he brings to his conclusions, that th 
Plete only when the ceedigie shall have been extended to every gland 
: out the structure. : 
i hysiol 1 conditions, 
It results tar the = that if, as 5 pl ea) ao Hee 
Thi: PY . . . i 
of get io hat ate et to study now the venous blood in 
the state of and in the state of functional activity. It is ror 
blood goes ou red from the glands in activity, 
