194. THe Microscope. 
ADDITIONAL EXCHANGES, CONTINUED FROM PRE- 
CEDING PAGE. 
(This is a very interesting column to those engaged in practical work. Send 
on your notice and enter the list.) 
MPHIPLEURA PELLUCIDA or any other test diatom mounted in 
the new medium having refractive index of . 2.4 can be pes from 
H. H. CHASE, M. D., Geneva, INE 
~ECTIONS of bone of cat, and purcupine quill, seed of Papara somni- 
ferum and Lychnis githago,eye spots and pieces of wings of Attiacus 
cebropia and prometheus, etc.,for other good slides. HOWARD N.LYON, 
80 South St., Auburn, N. Y. 
| WILL send a quantity of good diatomaceous material containing Baccil- 
aria Paradoxa—all living—in exchange for well mounted slides. JAS. 
C. LATHROP, Bridgeport, Cot:n. 
IVING or mounted red astasia hematoides (Buglena viridis) also Valvox 
and other choice Alge in exchange for Algae, fungi or infusoria. J. 
M. ADAMS, Watertown, N. Y 
ILL Exchange mounted slides of various crystals, diatoms, in situ, stel- 
lete hairs of plants and micio fungi, for other good slides or material. 
JAMES BE. WHITNEY, Rochester, N. Y 
A'THOLOGICAL, Histological and other well mounted slides will be ex- 
changed for mounted specimens of interest. Lists furnished on applica- 
tion. D. E. HAAG, M. D., Liberty Center, Henry County, Ohio. 
OULD like to exchange a 1-6 objective, 160°, adjustable, for a lower 
power. A. Y. MOORE, 89 Prospect street, Cleveland, Ohio. 
