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The normal cerebro-spinal fluid is clear and colourless, has a specific gravity of 1004–1008, and contains a trace of serum globulin and albumose, some chlorides, and a substance which reduces Fehling's solution.

Freudenreich believes it is able to change casein into albumose and peptones, but that the lactic-acid bacteria are chiefly responsible for the further decomposition of the nitrogen to amid form.

The absence of subsequent suppuration, however, was definitely opposed to this view, and suggested that the fever resulted from absorption of some element of the blood, possibly the fibrin ferment, or some form of albumose.

By means of two recurved fangs attached to the upper jaw, and connected by a duct with poison-secreting glands, they introduce into their prey a thick, transparent, yellowish fluid, of acid reaction, probably of the nature of an albumose, and known as the venom.