experimental animal

If the broth outside the sac remains sterile, insert the sac in the peritoneal cavity of the experimental animal.

The method of performing the operation is varied slightly according to the size of the experimental animal.

Small tube of emulsion of bacteria of the species responsible for the infection of the experimental animal.

After an incubation period of three and a half days the experimental animal contracted a well-marked case of the disease.

But this experimental animal psychology has so far served theoretical interests only.