Journal op Entomology and Zoology — Advertising Section 
The Journal of 
Zoological Research 
l-AUtrd by 
WALTER K. COLUXdE, M. Sc, F. L. S., F. E. S. 
The Gdlty Marhic L(ihor(ito7'y 
The University. St. Andre-icn, Seothind 
The subject matter is strictly confined to original zoolo^fical 
research — systematic and anatomical. Fully illustrated by 
lithographic plates and text Hgures. 
Each volume will consist of 4 i)arts. price '^5. 
All siilifienpt'inna sliould fiejonciirded to 
Messrs. Dulau & Co., Ltd. 
37 Soho Square, London, W., England 
It does away 
with the old 
Cumbersome 
Lantern -sHde 
Holder 
A relic of a 
Quarter Centurv 
A so 
Spencer Delineascope 
F'or Protection of L,antern Slides 
Has incorporated in it the SPENCER TRANSPOSEH, a patented 
mechanical means for handlinjjt the slides, which, in addition to jnitting 
a ban on the old cumbersome and troublesome slide holder, nives a 
dissolving effect which is acconi|)lished with but one outfit oidy (not two). 
This feature has been pronounced the only real stereo|)ticon advance in 'J.*) years. 
Its nitroiren filled Mazda Lanij) ,ilso adds to its convenience and efficiency. 
i'litato'^ free on request. 
SPENCER LENS COMPANY, Buffalo, N. Y. 
Maker.'! of Superior MICROSCOPES and MICROTOMES 
