Page:The Zoologist, 4th series, vol 5 (1901).djvu/260

236 respecting the weight of different animals. Enquiries were therefore addressed to one of the leading experts on this subject, Mr. Carl Hagenbeck, of Hamburg, by whose courtesy the following data were contributed. The average weight of adult individuals of the subjoined species and varieties of animals is as follows:— According to these data the certain lethal doses for the internal application of strychnia nitrate are, in round figures, as follows: —

The lethal doses suitable for birds of prey may be calculated from a table which I. Schneider has recently compiled for a few domesticated birds. According to this table the internal lethal doses per kilo (2i lb.) are as follows:— The corresponding experiments showed that it was immaterial both with regard to the intensity of the action and the time required for the fatal issue whether the preparation was given as an aqueous solution, or whether the birds were fed with strychnia wheat.

In the general interest it may be mentioned that, as pointed out by