From the above studies the following conclusions have been reached:

1. That copper or its compounds used does not cause the deposition of pigment in the livers of rabbits, guinea pigs or rats. Neither does it produce a cirrhosis in these animals.

2. That spontaneous deposition of pigment occurs frequently in the livers of normal rabbits on the usual laboratory diet.

3. That the feeding of a diet of carrots exclusively will produce pigment deposition in the livers of rabbits, in every way identical with that ascribed to copper.

4. That the pigment deposited in the livers of rabbits is probably of exogenous origin.

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