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YOU WILL BE INTERESTED IN 



A Naturalist in the Great Lakes Region 



By Elliott 11. Downing 

 A new type of illustrated Nature-guide that will help the student to identify 

 the living' things he sees on the earth and in the air and water by showing 

 how Nature, following a definite system, has combined plant and animal life 

 into groups or associations. A book for the hiker's knapsack and the 

 nature-study class. 



Educational Edition, cloth, $2.50; postpaid, $2.60 



Dc Luxe- Edition, flexible binding, $3.50; postpaid, $3.60 



Methods n P ant Histology 



Bj^ Charles Joseph Ch.\mberlain 

 This book (third edition, completely revised) contains directions for collect- 

 ing and preparing plant material for microscopic investigation. Killing 

 and fixing, freehand sectioning, the paraffin method, the Venetian turpen- 

 tine method, the celloidin method, and the glycerin method are treated in 

 detail, and chapters on making photo-micrographs and lantern slides have 

 been added. Methods in Plant Histology may be used in classes under an 

 instructor, but the directions are so explicit that students working alone 

 should soon learn to make first-class preparations. 



Illustrated, $3.25; postpaid, $3.37 



Essentials for the Microscopical Determination of 

 Rock—Forming Minerals and Rocks 



By Albert Johannsen 

 A laboratory manual designed to provide students of petrology with in- 

 formation on methods of determining microscopically the points of separa- 

 tion between similar minerals and their modes of occurrence. In addition, 

 this new manual, which is the only volume of its kind in the field, contains 

 in the back of the book a folding alphabetical list in such a position that 

 reference may be made without turning pages, making possible a presenta- 

 tion in condensed form of the optical constants of the minerals, many points 

 of separation between similar minerals, and the modes of occurrence of 

 most of them. Cloth, $2.00 ; postpaid, $2.15 



A Laboratory Manual for Comparative Vertebrate 

 Anatomy ^y Libbie h. Hyman 



After some general chapters on animal form, the characters and classifica- 

 tion of the chordates, and vertebrate development, the manual takes wp in 

 a comparative way each system of vertebrates beginning with the exo- 

 skeleton and ending with the nervous system. An important feature of the 

 volume is the explanatory matter which accompanies each system. The de- 

 scription of the anatomy of these systems is preceded by a general account 

 of their evolution in order that the student may understand better the con- 

 ditions in the specimens which he dissects. Cloth, $2.50 ; postpaid, $2.62 



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