Each volume will consist of 4 parts, price $5.

All subscriptions should be forwarded to

Messrs. Dulau & Co., Ltd.
37 Soho Square, London, W., England


A simple, well constructed
bacteriological incubator

GAGE—The Microscope

An Introduction to Microscopic Methods and to Histology

By SIMON H. GAGE. Twelfth Edition. Entirely rewritten, and with many new illustrations. Price, postpaid, $3.00.

This work aims to give help to everyone who uses the microscope, whether he is a beginner or an advanced worker.