Neurological Technique 



By IRVING HARDESTY 

 196 pages, 8vo, cloth ; net $1.75, postpaid $1.87 



t NT ENDED to serve as an introduction and laboratory guide to the study of the 

 — architecture of the nervous system, containing a succinct account of methods 

 which have stood the teM of practical application. 



'•The instructions are thorough lv practical/ — "The descriptions are clear." — Philadelukia 

 British Medical Jwrnnl. ' Medical Journal. 



e book hears the indorsement of Henry 



Laboratory Outlines for the Study of the Embryology 

 of the Chick and the Pig 



By FRANK R. LILLIE 

 60 pages, 12mo, paper; net 25 cents, postpaid 27 cents 



"TTTlLL be found a valuable contribution toward the establishment of a standard 

 VV of embryologieal work for students generally, and for others desiring a con- 

 venient guide to the order of study of this subject. 



Quantitative Classification of Igneous Rocks 



Based on Chemical and Mineral Characters, with a Systematic Nomenclature 

 By WHITMAN CROSS, JOSEPH P. 1DDINGS, LOUIS V. PIRSSON 

 and HENRY S. WASHINGTON 

 286 pages, 8vo, cloth ; net $1.75, postpaid $1.91 



A N entirely new system for the classification and nomenclature of igneous rocks 

 according to chemico-mineralogical principles, accompanied by a complete 

 original nomenclature adapted to the system. Of value to all geologists and 



The Role of Diffusion and Osmotic Pressure in Plants 



By BURTON EDWARD LIVINGSTON 

 160 pages, 8vo, doth ; net $1.50, postpaid $1.62 

 rpHE important part played by the phenomena connected with diffusion and 

 -1- osmotic pressure in the life-process has here for the first time found full and 



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