140 



THE AMERICAN MONTHLY 



[July, 18.^2. 



this study. Careful reading will convince 

 any person that he has succeeded most 

 admirably. No one could write a book 

 like this, without a thorough knowledge 

 of the subject, and a sincere interest in 

 the work, such as Mr. Hervey certainly 

 possesses. 



In the Introduction, is given advice 

 about collecting and preserving specimens 

 of marine alg^e, and arranging them for 

 the herbarium, with other useful informa- 

 tion. The succeeding chapters relate to 

 the study of the plants. Each chapter 

 opens with a " key to the genera," and 

 the species are then fully described in 

 plain language, without the use of scienti- 

 fic terms. Each plate represents a char- 

 acteristic species of the genus in the 

 natural color of pressed specimens, many 

 of which will be instantly recognized by 

 those in the least familiar with our most 

 common forms. No attempt is made to 

 carry the information beyond what the 

 amateur collector requires for naming the 

 specimens that may be found, but there 

 is sufficient for this purpose. The book 

 will surely be the constant companion of 

 a large number of people whoTisit the 

 sea-shore this summer, and it will well 

 repay careful perusal. It is not saying too 

 much to add that it is one of the very few 

 books designed to make scientific studies 

 popular and attractive, that fulfills their 

 purpose well. No reader of this Journal 

 should visit the sea-shore, without a copy 

 of this book. It is written in a good 

 style, is well printed and the binding is 

 artistic. 



Civilizatton in its Relation to the Decay 

 of the Teeth. By Norman W. Kings- 

 ley, M. D. S., D. D. S., etc., etc. New 

 York : D. Appleton and Company. 

 (Pamphlet, pp. 10.) 



A concise and clear statement of specu- 

 lative and fallacious ideas concerning the 

 increased decay of teeth prevailing in 

 later generations. After stating and con- 

 tradicting these theories, he shows how 

 the effects of refined and luxurious life in 

 the strain of mental labors upon the 

 nervous system, diverts the nutrition of 

 the body to repair waste of nervous tis- 

 sues, and fails to build up muscular or 

 dental growth, or to sustain it. Hence 

 nervous diseases and " caries " are greatly 

 upon the increase. Proper nutrition be- 

 ing withdrawn,! eeth are more susceptible 

 to external agencies ; and for the same 

 cause, new generations inherit an enervat- 

 ed condition, which includes poorly 



organized teeth. The remedy lies in 

 lessening care and anxiety, in giving 

 more attention to hygiene and habits of 

 living. To sum up; the secret of ner- 

 vous exhaustion and teeth-decay, lies 

 not in work but in worry. 



E. C. H. 



Exchanges. 



[Exchanges are inserted in this column without 

 charge. They will be strictly limited to mounted 

 objects, and material for mounting.] 



On receipt of a well-mounted slide, I will send a 

 slide of crystal, (for the polarizer) of any of the rare 

 vegetable products which I may have ; will send list 

 of same on receipt of postal request. 



J. KETCHUM, Jr., 

 P. O. Box 877, New York City. 



Wanted. — Animal parasites, Ixodes, Acari, etc., 

 either mounted or unmounted. W. A. HYSI.OP, 



22 Palmerston Place, Edinburg, Scotland. 



Mounted slides of Selenites for the Polariscope, in 

 most beautiful and brilliant colors, in exchange for 

 first-class Histological and Pathological slides and 

 slides of diatoms, algs, etc., 



A. C. GOTTSCHALK, 

 193 North Salina Street, Syracuse, N. V. 



Unmounted objects, Foraminifera, Spicules, Plant- 

 hairs, Zoophytes, etc., in exchange for other objects, 

 mounted or unmounted. 



E. PINCKNEY, Dixon, 111. 



Wanted — First-class mounts of double-stain vege- 

 table preparations in exchange for first-class insect 

 preparations. H. S. WOODMAN, 



P. O. Box 87, Brooklyn, E. D., N. Y. 



Wanted — First-class prepared and crude material, or 

 mounted objects, in exchange for diatoms in situ or 

 other first-class crude material, or for mounted objects. 

 M. A. BOOTH, Longmeadow, Mass. 



Niagara River Filterings fnr mounted slides. 



H. POOLE, Buffalo, N. Y. 



Wanted — Good gatherings of Diatoms, fossil or re- 

 cent, especially of test forms. Liberal exchange in fine 

 slides ; prepared or rough material. Lists exchanged. 



C. L. PETICOLAS, 635 8th street, Richmond, Va. 



Good, uncleaned Diatomaceous material containing 

 A rachnoidiscuSy Helio/>elta,Fieurosigtna,^ Isthmia, 

 Triceratium^ Surirella gemma and Terpsiuoa? 

 mitsica wanted, in exchange for well-mounted slides 

 of arranged diatoms, etc., or cash. 



DANIEL G. FORT, Oswego, N. Y. 



Well-mounted Histological and Pathological slides 

 in exchange for other firsi-class slides. 



LEWIS M. EASTMAN, M. D., 

 349 Lexington Street, Baltimore, Md. 



For exchange: Mounted thin secti ns of whale- 

 bone, soapstone, serpentine, albite, .eldspar, etc.; 

 al^o opaque mounts of several very beautiful fossili- 

 ferous limestones. 



Rev. E. A. PERRY, O'incy, Mass. 



