20 THE AMEKICAN MONTHLY [January, 



The author does not attempt instruction in microscopic anatomy, but 

 his book is nevertheless a remarkable demonstration, the work now 

 being done with the microscope. A great number of the figures are 

 of microscopic objects, and a large part of the information given has 

 been derived by the use of the microscope. Among the topics illustra- 

 tive of this fact are the cell, yeast, protococcus, proteus, mold, bacteria, 

 vorticella, polyps, etc., in the chapters on general biology; the char- 

 acter and composition of the spinal cord as shown in sections ; the 

 papillae of the skin and tongue ; the circulation of the blood in the web 

 of a frog's foot, etc. In the chapter on blood are given good illustra- 

 tions of the leucocytes, the corpuscles, and the blood plaques. The 

 blood is discussed not only microscopically, but chemically. There is 

 a folded plate representing gastrulation which is deserving of especial 

 mention. Therein are figured eggs of amphioxus, frog, man, fish, and 

 crab, credit being given to Haeckel therefor. The whole subject of 

 reproduction is fully and clearly set forth. Under this chapter are 

 shown the microscopic structure of the placenta. Many other subjects 

 would be w^orthy of special mention did our space permit. Those of 

 our readers who are teachers of physiology would do well to have the 

 book in their libraries, as it would enable them to supplement smaller 

 and older treatises in a highly satisfactory manner. 



SUBSCRIBERS' NOTICES. 



[These notices will be given six insertions in this column at 25 cents per line or fraction thereof. 

 FOR EXCHANGE.— Slides of selected diatoms. D. B. WARD, Poughkecpsie, N. Y. 



WANTED. — Unmounted microscopical material, also micrographic dictionary. Will exchange or 

 buy. CHARLES VON EIFE, 124 Clinton Place, New York City. 



WANTED. — A clean copy of Rev. William Smith's British Diatoms, and Schmidt's Atlas of the 

 Diatomac^ae. JAMES B. SHEARER, Bay City, Mich. 



OFFERED. — Diatomaceous Earth from Utah (Desert) for Histological Mounts. 



PROF. ORSON HOWARD, Salt Lake City, Utah. 



CORRESPONDENCE invited with a view to the exchange of either mounted or unmounted Oribatida 

 (British) for American species. E. BOSTOCK, Stone, Staffordshire. 



WANTED. — Any works on Microscopy not already in my Library. 



H. M. WHELPLEY, F. R. M. S., St. Louis, Mo. 



WANTED.— (In excnange for slides.) "Microscopical Bulletin," Vol. L No. 5, August, 1884. 



M. S. WIARD, New Britain, Conn. 



Labels in exchange for slides. ^^ EUGENE PINCKNEY, Dixon, 111. 



First-class Histological Slides for other good mounts ; Histological and Pathological material cut on 

 shares. S. G. SHANKS, M. D., 547 Clinton Ave., Albany, N. Y. 



OFFERED. — Griffith & Henfry Micrographic Dictionary to be sold; also Hoggs Microscope. 



J. P. WINTINGHAM, 36 Pine St., N. Y. 



WAN I'ED. — A clean copy of Wolle's Fresh- Water Algee of the United States (2 vols.) ; also good 

 second-hand Gruiiow Camera-Lucida, and a selt-centering Turn-table. 



JOS. P. THOMPSON, P. O. Box 1383, Portland, Me. 



FOR SALE CHEAP. — New Gundlach ^g homogeneous- immersion objective, for ^V glycerine or 

 water objective. 



FOR SALE. — A Bausch & Lomb Stand, A. & C. eyepieces, 1 in. and } in. objectives. 



BOX I, Evanston, 111. 



FOR EXCHANGE. — Cabinets of lower silurian fossils for microscopical apparatus. Correspondence 

 invited. E. L. SHERWOOD, Houston, Miss, 



OFFERED. — ^4co in prizes. For details see article in January number of this journal for 1890. 

 ^ C. A. STEPHENS, Norway Lake, Me. 



