Ten cats were used for this series of experiments, and the doses
administered varied between 103 and 139 mg per kilo. The results shown
in the appended table (p.58) indicate that about 120 to 140 mg of
caffein per kilo may induce mild symptoms in some cases. The conclusion
may be safely drawn therefore that 150 mg per kilo is approximately the
minimum fatal dose for the cat when the drug is given subcutaneously.
That smaller doses are, however, by no means to be regarded as always
safe is shown in the following experiments.