264 Tur Microscopr. 
UNDLACH’S adjustable 1-5 objective, 135° aperture, for sale. Dr. A. 
C. Stokes, Trenton, N. J. 
IATOMS ON ALGA. Achnanthes bevipes, ete., Polycistana, Fossi 
Diatoms, ete., Sertularia Pluma, Sertularia Crustata, ete. Spore case 
of Fern too numerous to mention, to exchange for well mounted objects 
WM. FARNELL, Macon, Ga. 
LEASE ANNOUNCE that I will supply labels, cards, and other tirst- 
class printing in exchange tor good slides) EUGENE PINCKNEY, 
Dixon, Ii). 
XCHANGE.—Untreated diatoms and miscellaneous material in large 
variety to exchange for good prepared material for mounting of any 
kind. M.A. BOOTH, Longmeadow, Mass. 
XCHANGE—I have about one hundred lantern slides to exchange for 
Microscopical apparatus (object-glasses), ete W.S. WHITE, 128 and 
130 W. Main street, Kalamazoo, Mich. 
XCHANGE.—A Tolles’ Binocular Eye-piece, (cost $80.00), for a first- 
class, wide angle Objective. J.T. MAIN, Jackson, Mich. 
CARI INSECTS, Pathological and other well mounted slides in ex- 
change for Pleurosigma, ‘Trichina, Diatoms, Stained Bacteria, etc. 
J. O. STILLSON, Indianapolis, Indiana. 
Fo® Sales! SALE,—Slides, double stained, of Bacillus Tuberculosis, 50c. each. 
DR. W.R. CHI’ LICK, 83 Lafayette Avenue, Detroit, Mich. 
ANTED.— Books treating on microscopical and histological subjects 
not already in my possession. Will pay eash or give slides in ex- 
change. State name of the work, date of issue, and price. C. H.STOWELL, 
Ann Arbor, Mich. 
MPHIPLEURA PELLUCIDA or any other test diatom mounted in 
the new medium having refractive index of , 2.4 can be procured from 
H. H. CHASE, M. D., Geneva, N. Y. 
SECTIONS of bone of cat, and purcupine quill, seed of Papara somni- 
ferum and Lychnis githago,eye spots und pieces of wings of Attiacus 
cebropia and prometheus, ete.,for other good slides) HOWARD N. LYON, 
80 South St., Se emcee ING Ys: 
I qa Wines send a quantity of good diatomaceous material containing Baccil- 
aria Paradoxa—all living—in exchange for well mouuted slides. JAS. 
C. LATHROP, Bridgeport, Corn. 
IVING or mounted red astasia hematoides (Euglena viridis) also Valvoa 
and other choice Alge in exchange for Algue, fungi or intusoria. J. 
M. ADAMS, Watertown, INS YG 
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 iuterest. 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. 
