The conditions under which this, the third edition, has been prepared, have been somewhat adverse. While it was considered desirable to add brief accounts of a number of drugs in less frequent use, due regard has had to be given to the high cost of production. A reduction in the number of pages has been made possible by the use of a slightly smaller type and by the omission of the classification according to natural orders and of a few of the illustrations. Notwithstanding this reduction in size, the number of drugs dealt with has been very considerably increased, and numerous notes have been added in order to increase the general utility of the work.

All temperatures are now stated in degrees Centigrade.

H. G. G.