1891.] MICKOSCOPICAL JOURNAL. 143 



to make drawing one of the fundamental subjects of instruction in the 

 public schools. Teachers and others interested in drawing should ex- 

 amine this critical analysis of the Prang course. 



Prof. Koch's Method to Cure l^uberculosis. By Dr. Max Birnboum. 

 H. E. Haferkoi'n, Milwaukee, Wis. 1891, pp. 105. Price, pa- 

 per, 75 cents; cloth, $1.00. 



Though the excitement attending the announcement of an actual 

 remedy for tuberculosis has somewhat subsided, the literature upon the 

 subject is still studied with deep interest. The present treatise, which 

 is a translation from the German of Dr. Max Birnboum, is a popular 

 treatment of Dr. Koch's method, and is easily within the grasp of all 

 who may feel interested in it. 



Catalogue of Microscopes. (Illustrated). 8°, 48 pp. VV. Watson 

 & Sons, London, England. 



In their new edition of this catalogue Messrs. Watson & Sons have 

 embodied instruments of their o-svn make: Microscopical apparatus, 

 eye-pieces, objectives, mounting materials, micrographic cameras, etc., 

 etc. 



Price lists are also included, quotations being given at the very low- 

 est figure for which the articles can be produced. Illustrations of many 

 of the stands, together with their descriptions, are given. Catalogues 

 can be obtained by addressing the above firm. 



Microscopic Objects. 8°, 40 pp. W. Watson & Sons, London, 



England. 



This is a classified list of first-class objects affording instructive illus- 

 trations in anatomy, physiology, botany, entomology, geology, mine- 

 ralogy, micro-photographs, and polariscope specimens. This catalogue 

 is intended as a guide in the selection and purchase of objects, and. a 

 copy can be obtained on application to the above firm. 



Catalogue aizd Anftouncement , 1891. Ginn & Co., Boston. 



Those conversant with books know the value of the annual catalogue 

 of this firm. The extension of their list in both the elementary and 

 higher departments compels them this year to separate the two classes 

 of books more strictly than heretofore. The firm's announcement for 

 the current year names all of their publications, and gives the prices, 

 with some other particulars of those it dots not describe. Any one 

 desirous of keeping abreast of the literature of the day should send for 

 a copy of the catalogue. 



Potable Water. By Floyd Davis, M. Sc, Ph. D. Silver, Bur- 

 dett & Co., publishers, Boston. 12°, 118 pp. (price, $r.oo). 



The impurities in drinking water that are frequently the cause of dis- 

 ease and death are discussed here. The natural and artificial processes 

 of removing them from water are also given due consideration. The 

 discussions are clear, compact, and satisfying. They cover well the 

 field of inquiry, and display a thorough knowledge of the subject in 

 hand. 



Chapter I treats of pure water, and defines the terms pure and im- 

 pure, wholesome and unwholesome, from the sanitary standpoint. 



