SCIENCE 



New Series ■4- 



VoL. LVI, Xo. 145c(i 



Friday, November 10, 1922 



Annual Sdbsceiption, $6.00 

 Single Copnts, 15 Crs. 



New Blakiston 



HOYT— Concise Physics for Engineering Stude 



179 Illustrations. Cloth, $2.50. 



By John E. Hoyt, Ph.D., Head of Physics Department, Drexel Evening School; 

 Assisted by Charles A. Bareuther, B.S. C.E., and N. M. Chamberlain^ 

 B.S., A.M., of the Faculty Drexel Evening School, Philadelphia. 



The text is free from hair-splitting theoretical distinctions, and detailed descriptions of 

 mechanical or electrical devices which properly belong to advanced engineering. 



Characteristic features are the conciseness of treatment of fundamental principles with 

 special reference to their application to engineering; the solution of illustrative problems 

 and the large number of practical problems, mostly new, submitted for solution bv the 

 student. 



Some special features are— a simple and practical chapter on measurements, errors, ac- 

 curacy and precision and significant figure,— fundamental subjects not often introduced 'out- 

 side technical books— involving advanced mathematics ; a general treatment of physical com- 

 putations, principles and methods of curve plotting and use of vectors, with applications later, 

 as the need arises; logical treatment of Mechanics under the headings of Kinematics, Dy- 

 namics and Statics. The chapter on Electrostatics has been reduced to the minimum amount 

 required to familiarize the student with such ideas as "Potential," "c-apacity" and other fun- 

 damental conceptions. Insistence upon the distinction between potential difference and elec- 

 tromotive force. This distinction has been found by the author, in common with others 

 who have insisted upon the same discrimination, to aid in preventing confusion, especially 

 when the student considers the potential difference at the terminals of a battery, a dynamo, 

 or a motor. 



Attention is called, all through, to the fact that all formulas are merely mathematical ex- 

 pressions of definitions or laws, true under certain stated conditions. If these conditions be 

 observed "theory and practice" must always agree. 



Seventh 

 Edition 



BRUBAKER-Textbook of Human Physiology 



Revised. Enlarged. 367 Illustrations. Cloth, $4.75. 



By Albert P. Brubaker, A.M., M.D., LL.D, Professor of Physiology and Medi- 

 cal Jurisiiriidence, Jefferson Medical College, Philadelphia. 



In this edition are many new facts which throw light on hitherto obscure problems. 

 They relate to vitamins; chemistry of blood; physiological action of the heart; action of 

 vagus nerve on the heart; chemic relations of oxygen and carbon dioxide in blood; respira- 

 tion, in high altitudes; modern colorimctric appliances; secretion of urine; acidosis; basal 

 metabolism; nerve activities and coordination, etc. 



P. BLAKiSTON'S SON & CO. 



Publishers Philadelphia 



