138 THE AMERICAN MONTHLY [July. 



nent value and suggestions of importance grew out of his work on the arthropods, and 

 from the activity of mind and his perseverance all who knew him were glad to join 

 in the enterprise of publishing his thesis as it left his hands, incomplete though it was. 

 It is not only a memorial to his power, but a contribution of permanent value to science. 



77/1? Book of Plant Descriptions, or Record of Piant Analyses. By Geo. G. Groff. 

 Lewisburg, Pa. 

 The value of recording the results of observations in science study is twofold : — first, 

 by requiring definite statements it sharpens the observations ; and, second, it preserves 

 work done as a permanent possession of the worker. The latter becomes important 

 if he is likely to continue his work at all extensively. The former purpose is alone 

 sufficient to justify the large number and variety of works, tables, etc., of the kind 

 before us. It presents a syllabus of the terms most frequently used in pha^noyamic 

 descriptions with brief definitions, suggestions for laboratory work in plant morphology 

 and physiology, blank pages for the exact description of a plant which is being sys- 

 tematically dissected. A very commendable feature of the blanks is the insertion 

 of the word indicating the exact point described before the blank place which the de- 

 scription is to fill. Thus, after anthers we find attachment , shape , aspect 



, dehiscence , No. cells , pollen . By asking a series of definite ques- 

 tions this brings the student to see in their best order the important anatomical facts. 

 The margin of each page contains blank spaces with names for the reception of draw- 

 ings illustrating the plan of the flower, the section of the flower, the structure of the 

 stamen, pistil, ovary, etc. Upon the whole we regard the work as one of the most 

 satisfactory we have seen. The binding by means of staples prevents the book from 

 opening flat. 



Exchanges. 



[Exchanges are inserted in this column without charge. They will be strictly limited to mounted objects, and 

 material for mounting.] 



OFFERED. — Diatomaceous earth from Thibet, various localities (12,000 feet); also, material and slides of 

 diatoms from Scottish Highlands, and continental foraminiferse. WANTED. — Slides of American diatoms, 

 insects, or botany. W. D. STEWART, 2 Gilmore Terrace, Edinburgh, Scotland. 



OFFERED. — Sections of vegetable ivory and slides of crystalized maple sugar. Good mounts taken in 

 exchange. WM. LIGHTCJN, 106 Filth Avenue, Leavenworth, Kansas. 



WANTED. — Parasites and books on Parasites and other micro, subjects. Will give Anatomical, Pathologi- 

 cal Botanical, Micro-fungi, Zoophytes, Polycistinee, Foraminifera, Parasites, and other slides in return. 



FRED. LEE CARTER, Gosforth, near Newcastle-on-Tyne, England. 

 Wanted, Diatomaceous earth from Megillanes, Bolivia, South America. Can give in exchange either Dia- 

 tomaceous earth from New Zealand or cash. E. MICHALEK, 



L Fleischemarkt, No. i, Vienna, Austria. 

 Mounted sections of Foetal Lung (5 months), sections across entire lobe, ,^,,',7^ in. thick, beautifully stained, in 

 exchange for first-class pathological slides. W. C. BORDEN, M. D., U. S. A., 



Fort Douglas, Utah. 

 Wanted, earths, recent diatoms, and miscellaneous objects for mounting. Only first-class material offered or 

 desired. MARY A. BOOTH, Longmeadow, Mass. 



Fossil Diatomaceous deposits (marine) wanted from Bermuda, Virginia, Maryland, California, etc. 



L ELLIOTT, Ardwyn Villa. Aberystwith, Wales, England. 

 Labels for slides. EUGENE PINCKNEY, Dixon, 111. 



Correspondence relative to exchange in microscopical material or prepared mounts. 



HENRY L. OSBORN, Hamline, Minn. 

 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. 



Notices. — All communications for publication should be addressed to Henry Leslie Osborn, Hamline 

 University, Hamline, Minn. 



Subscriptions, and all matters of business, should be addressed to Chas. W. Smiley, P. O. Box 630, 

 Washington, D. C. , , , , • 7 7 r. 



Subscription price $1.00 PER YEAR strictly in advance. All subscriptions should end ivith the De- 

 cember number. A pink wrapper indicates that the subscription has expired. A date on the wrapper in- 

 dicates the month to which payment has been made. 



Orders for slides advertised by A. J. Doherty in the Journals from January to April, 1887, may be sent 

 through P.O. Box 630, Washington, D. C. 



A few copies of Leidy's Fresh-Water Rhizopods, of North America, can still be had at $5 00 per copy.— P 

 O. Box 630, Washington, D. C. • , , t-. r 



Remittances should be rKade by postal notes, money orders, or by money sent in registered letters. Drafts 

 should be made payable in Washington, New York, Boston, or Philadelphia. 



The first volume, 1880, is entirely out of print. The succeeding volumes will be sent by the publisher for 

 the following prices which are net :— Vol. II (1S81) complete, $1.50 ; Vol. Ill (18S2), out of print ; Vol. IV 

 (1883) complete, $1.50; Vol. V (1884) complete, $1.50 ; Vol. V (1884), Nos. 2-12, $1.00 ; Vol. VI (1885), $1.50; 

 Vol. VII (1886), Si.oo; Vol. VIII (1887), $1.00. As calls for Volumes I and III sometimes occur, those persons 

 having copies to dispose of would do well tc inform us, and to state their prices. 



