192 THE AMERICAN MONTHLY. [August. 



most eminent representatives of the French School of Psychology, has 

 presented in the above work the most important results of recent investi- 

 gations into the world of micro-organisms. The data of this depart- 

 ment of natural science lie scattered for the most part in isolated reports 

 and publications, and no attempt has hitherto been made to collate and 

 present them in a systematized form. Especial use has been made of 

 the investigations of BalbianL Claparhde and Lach7na7tn, Maupas^ 

 Ribot^ Engelmann^ Poiichet, Weber. Pfeffer^ Kettt^ Dujardin^ 

 Gruber^ Nussbaum^ Biitschli^ Lieberkiihn. The cuts, eighteen in 

 number, are illustrative of the movements, nutrition, digestion, nuclear 

 phenomena, and fecundation of proto-organisms. The most interesting 

 chapters are those on fecundation, which demonstrate the same instincts 

 and vital powers to exist in spermatozoids as are found in animals of 

 higher organization. 



M. Binet's researches and conclusions show '• that psychological 

 phenomena begin among the very lowest classes of beings ; they are 

 met with in everv form of life from the simplest cell to the most com- 

 plicated organism." The author congests the theorv of Romanes, who 

 assigns the first appearance of the various psychical and mental facul- 

 ties to dirterent stages or periods in the scale of zoological development. 

 To M. Binet there is an aggregate of properties which exclusively per- 

 tain to living matter, the existence of which is seen in the lowest forms 

 of life as well as in the highest. 



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, Poughkeepsie, N. Y. 



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

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



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

 Diatomaceae. 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. — Specimens of rocks for slicing and grinding into sections ; also bones and teeth of diflFer- 

 ent animals, diatorp.s in situ on algae, diatomaceous and polycysiinous earths, ocean soundings, etc., etc. 

 Liberal exchange in microscopic slides or cash. 



ARTHUR J. DOHERTY, 63 Burlington St., Manchester, Eng. 



TO EXCHANGE. — Native gold, silver, copper, lead, zinc, and other beautiful cabinet specimens, 

 polished ornaments and sections of petrified wood — Chalcedony — and native turquoise, agate, amethyst, 

 rubies, etc.; also Indian ornaments, curios, arrows, blankets, pottery, etc.; pelts of wild animals, species 

 of native cactus, and a good second-hand " Burt's Solar Compass" complete. Any or all of the above 

 are offered in e.xchange for new, or good second-hand, objectives, condensers, polarizers, stand, or other 

 microscopical apparatus. W. N. SHERMAN, M. D., Kingman, Arizona. 



OFFERED. — Zeiss' New Catalogue (in German) forwarded lor 10 cents in stamps. 



F. J. EMMERICH & SONS, 43 Barclay St., New York City. 



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



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



WANTED. — (In exchange for slides.) " Microscopical Bulletin," Vol. I, No. s, August, 1884, and 

 Vol. II, No. 1, February, 1885. M. S. WIARD, New Britai , Conn. 



Labels in exchange for slides. EUGENE PINCKXEY, 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. 



WANTED. — A set of Proceedings of the American Society of Microscopists. State price of set or 

 of single volumes, kind of binding, etc. Also, any other microscopical periodicals. 



P. O. BOX 630, Washington, D. C. 



