The KA Binocular Microscope

Is of great value in all biological work where low and medium powers are employed. In embryology the true stereoscopic image shows the relative position of important details. This feature is of great assistance to the student and makes the instructor’s work easy.

Write for booklet

Bausch & Lomb Optical Co.
of California

154 Sutter St., San Francisco, Cal.

The Journal of
Zoological Research

Edited by
WALTER E. COLLINGE, M. Sc., F. L. S., F. E. S.
The Gatty Marine Laboratory
The University, St. Andrews, Scotland

The subject matter is strictly confined to original zoological
research—systematic and anatomical. Fully illustrated by
lithographic plates and text figures.

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

GRIFFITH

Incubators

A simple, well constructed bacteriological incubator

The Journal of
Parasitology

A Quarterly devoted to Medical
Zoology

This journal will be a medium for the prompt publication of briefer papers and research notes on animal parasites. Emphasis laid on the morphology, life history and biology of zooparasites and the relations of animals to disease.

Subscription, $2.00 a volume

Managing Editor,

HENRY B. WARD,

Univ. Illinois, Urbana, Ill.