206 
PHYSIOLOGICAL PROPERTIES OE BLOOD. 
bear this in mind, for there can be no doubt that animals 
will thrive better when fed upon fresh and sweet than upon 
old, mouldy, or sour cake. 
The preceding seven analyses, on calculation, yield the 
following average numbers, expressive of the average compo¬ 
sition of thin decorticated cotton-cake: 
Water . . . . . . .9 28 
Oil ....... 1605 
^Albuminous compounds (flesli-formiag matters) . . 4P25 
Gum, mucilage, sugar, and digestible fibre (heat-pro¬ 
ducing materials) ..... 1645 
Cellulose (indigestible fibre) . . . .8*92 
Mineral matters (ash) . . . . . 8 05 
100*00 
* Containing nitrogen .... 6*58 
(7h be continued .) 
EXPERIMENTAL RESEARCHES ON THE PHYSIOLOGICAL 
PROPERTIES OE BLOOD CHARGED WITH OXYGEN AND 
OE BLOOD CHARGED WITH CARBONIC ACID. 
By M. E. Brow'n-Sequard. 
The scientific researches of MM. Dumas and Prevost are 
well known, which prove that the blood of sheep or of cows 
kills rabbits like a violent poison, and that the blood of the 
mammifera, injected into the veins of ducks, occasions imme- 
diatelv strong convulsions and death. 
M. Rayer has likewise mentioned having seen rabbits die 
almost instantly, after convulsions, when 5 grammes of human 
blood, defibrinated by beating, were injected into their veins. 
M. Rayer has even found three grammes of blood sufficient 
to kill a rabbit. 
Dieffenbach, Bischoff, and J. Miiller, after finding that 
defibrinated blood could be injected with less danger than 
non-defibrinated blood, thought that the fibrine of the blood 
of one animal was probably a poison to an animal of another 
species. In 1838, Bischoff made a discovery which should 
have led him to ascertain the real cause of the violent con¬ 
vulsions and death so often observed on transfusion : he 
found that he could inject, without perceptible injury, the 
arterial blood of mammifera into the veins of a bird, whereas 
the venous blood instantly killed. Bischoff was astonished 
