Three samples of coffee extracts were examined, viz: Serial Nos. 6875, 6895 and 6897. No. 6875 contained no caffeine. On further examination it was found to contain cereals or other starchy bodies and no coffee. This sample contained tin and traces of copper. The former amounted to 0.248 grams per 1,000 grams of the extract.

Sample No. 6895 contained 1.19 per cent caffeine. This is about Konig's mean (see p. 903) for roasted coffees; hence pound for pound this is about equal to average coffee. This sample contained considerable dextrose.

Sample No. 6,897 is a preparation of coffee with milk and sugar. This sample contains .72 per cent caffeine. On the basis of Konig's mean percentage of caffeine two-thirds of a pound of average coffee is equal to about 1 pound of this preparation. This sample contains both tin and copper in the following proportions per kilogram of the preparation:

Judging from the observations of Dr. Van Hamel Roos the amount of tin in these samples is excessive and the risk of poisoning is great. The article quoted by Dr. Van Hamel Roos is well worth reproducing.