xviii editor's note to the first edition 



sian. In these transliterations of Russian words into English the rules of the 

 U. S. Library of Congress have been followed, with a few slight modifications, 

 as follows: ia, tu, ie are all given as ia, in, ie; i, 'i and i are all given as i; the sign 

 of the silent letter between two others (') is omitted (Krasnoselskaia is used 

 instead of KrasnoseV skaia) and Yegunov is employed instead of Egunov, to insure 

 proper pronunciation. When the name is not certainly Russian and when sev- 

 eral spellings occur, the commonest form occurring in the German book is 

 adopted. In those cases where the paper cited is in Russian the author's name 

 is transliterated into English in the citation, as well as in the text, the title of the 

 paper being translated into English unless a title in French or German is avail- 

 able. In citations from languages other than Russian, author's names are given 

 just as they occur in the publications cited. The two or three spellings that 

 thus occur for the same Russian name are all given in the index, with the requi- 

 site cross-references. Thus, references to Ivanov are all given under this 

 spelling, but Ivanojj and Iwanow are also given, with the notation, " see Ivanov." 

 The index is somewhat more comprehensive than is the case with the orig- 

 inal, and authors' names have been inserted in the same alphabet with the 

 names of subjects. This feature of the index amounts practically to a bibliog- 

 raphy; references are given to all pages where the name in question is men- 

 tioned, and those pages that bear footnote citations of this name are indicated 



by full-face type. 



A note on the form of citation employed in this volume, and a selected list 

 of books bearing on plant physiology, are added after the present note. It is 

 hoped that these additions, as well as the citations of the book itself, may prove 

 serviceable to those who wish to acquire familiarity with the far-flung literature 

 of a subject that embraces the principles of many separately named sciences, 

 that brings into a single narrative such topics as ionization, adsorption, photo- 

 synthesis, fermentation, the forcing of azalias and the keeping-qualities of 

 apples. 



Laboratory of Plant Physiology 

 of the Johns Hopkins University. 



