TKANSLATOK'S PKEFACE 



IN preparing this abridged edition of Professor Tigerstedt's well-known 

 " Lehrbuch der Physiologic des Menschens " it has been my endeavor to bring 

 the book within the reach of the second-year medical student in this country. 

 Believing that those who would make use of the more highly technical parts of 

 the book,, as, for example, the mathematical considerations affecting the dynam- 

 ics of the circulation and the optics of vision,, already have access to these 

 very .valuable discussions in the German, I have, with the author's permis- 

 sion, omitted these parts. All other omissions and condensations have been 

 made with the single idea already named. I shall not here enumerate these 

 changes, because,, with the exception of a very few minor ones, which in the 

 interest of clearness it has seemed necessary to make in the proofs, all 

 abridgments have received the author's expressed approval. Professor Tiger- 

 stedt has placed me under very great obligations for the readiness he has 

 shown both to adopt my suggestions and to make others of his own motion. 



In the actual work of translation I have labored throughout to give the 

 author's thought a clear and accurate expression. While feeling my obliga- 

 tions to the author, therefore, I have endeavored (not always with success) 

 to leave as little resistance to the thought in the form of German idiom and 

 construction as possible. 



Following in jeneral the author's usage, I have employed italics for three 

 purposes : for generic and specific names, for emphasis, and for indicating 

 the key word, phrase, or clause of a paragraph. In this latter use they 

 serve the purpose of subordinate headings. 



The few additiorjs to the text which I have ventured to make and for 

 which I assume entire responsibility, have been selected from the most recent 

 literature and will be found, either enclosed in brackets or in the form of 

 foot-notes, bearing the customary signature. 



After examining a number of the additional illustrations which I pro- 

 posed be introduced for the benefit of American students, Professor Tiger- 

 stedt gave me his entire authorization to make such additions as I might 

 deem suitable. The authors from whose works these illustrations were orig- 

 inally taken are indicated in the several legends which accompany them and 



