Diatoms. 



Practical Directions for Collecting, Preserving, Trans- 

 porting, Preparing and Mounting Diatoms. By Prof. A. 

 Mead Edwards, M. D., Prof. Christopher Johnston, M. D., 

 Prof. Hamilton L. Smith, LL. D. 



12mo., Cloth. 75 cents. 



This volume undoubtedly contains the most complete series of 

 directions for Collecting, Preparing and Mounting Diatoms ever 

 published. The directions given are the latest and best. 



Common Objects for the Microscope. 



By Bev. J. G. Wood. Upwards of four hundred illus- 

 trations, including twelve colored plates by Tuffen West. 

 Illuminated Covers. 50 cents. 



This book contains a very complete description of the objects ordi- 

 narily met with, and as the plates are very good, and almost every 

 object is figured, it is a most valuable assistant to the young micro- 

 scopist. 



Five Hundred and Seven Mechanical Movements. 



Embracing all those which are Most Important in Dy- 

 namics, Hydraulics, Hydrostatics, Pneumatics, Steam 

 Engines, Mill and Other Gearing, Presses, Horology and 

 Miscellaneous Machinery; and including Many Move- 

 ments never before published, and several of which have 

 only recently come into use. By Henry T. Brown, editor 

 of the "American Artisan." Eleventh Edition. $1.00. 

 This work is a perfect Cyclopaedia of Mechanical Inventions, which 

 are here reduced to first principles, and classified so as to be readily 

 available. Every mechanic that hopes to be more workman, ought 

 to have a copy. 



The Six Days of Creation. 



The Chemical History of the Six Days of Creation. By 

 John Phin, C. E., editor of "The American Journal of 

 Microscopy." 12mo., Cloth. 75 cents. 



Stories About Horses. 



Just the Book for Boys. With eight full-page engrav- 

 ings. In Boarc^ 15 cents. In Cloth 50 cents. 



