These experiments were performed on well-fed animals which were kept
under observation for several days before the tests with caffein
were made. The diet consisted of meat exclusively. In some cases the
urine was examined for albumin and sugar before caffein was given. No
tests with caffein were made if large amounts of albumin were found.
It may be remarked that sugar was never found in cats before the
administration of caffein, but that considerable amounts of it were
found in some cases after it was given. Studies by various modes of
administration were made, by subcutaneous injection, intraperitoneally,
or by mouth. Attention was also directed to the resistance to caffein
in young cats, several experiments on kittens being made with this
object in view.