DETERMINED MARINE INVERTEBRATES A set of local starfish, sea urchins, etc. $5.00 DETERMINED AND MOUNTED INSECTS A set of all the important orders, labeled and in a box or case $6.00 A mounted collection of fifty common beetles, determined and labeled 6.00 A set of 25 butterflys, mounted and labeled 6.00 Other sets of determined insects may be obtained to order. ZOOLOGICAL CHARTS These are made on cloth and may be made to order. The charts may be in colors and cost from $1.00 to $3.00 each, according to the details. Special prices given on Anatomical, Physiological, Zoological or Entomological diagrams in one or several colors. ZOOLOGICAL OR ANATOMICAL MODELS IN CLAY OR WAX AND IN COLORS These also may be made to order, their cost depends upon the complexity. The following are some of the series: Brains of the chief vertebrate groups, set of six $5.00 to $10.00 Anatomy of clam, earthworm, starfish 10.00 Models of the development of the frog 5.00 Models of the development of the chick, etc. (OVER) =================================================================== ZOOLOGICAL OR HISTOLOGICAL MICROSCOPIC SLIDES Sections of starfish, whole small starfish, young crustacea, etc., sections of organs for classes in Physiology. These slides will be made to order from any animal or any tissue for from 25 cents to 75 cents a slide with reduction in price for sets of twelve or more. Serial sections of embryos of mammals, reptiles, birds, fish or invertebrate embryos or adults will be made to order at from 25 cents to 75 cents a slide, depending upon the stain and character of the object. Prices include preservatives and containers in most cases. =================================================================== The KA Binocular Microscope [Illustration] 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_