NOTES AND COMMENT 167 



Bateson, W. Mendel's Principles of Heredity. Cambr. Univ. Press, 1909. 

 Berthelot, D. and Gaudechon, H. Synthese photochimique des hydrats de 



carbone aux depens des elements de 1' anhydride c.arbonique et de la 



vapeur de l'eau, en l'absence de chlorophylle; synthese photochimique 



des composes quaternaires. Compt. Rend. 150: 1690-1963, 1910. 

 Dixon, H. H. Transpiration and the Ascent of Sap. Prog. Rei. Bot. 3: 1-66, 



1909. 2 

 Lawson, A. A. Nuclear Osmosis as a Factor in Mitosis. Trans, Roy. Soc. Edinb. 



48: I, 7, 1911. 

 MacDotjgal, D. T. and Cannon, W. A. Conditions of Parasitism in Plants. 



Cam. Inst. Wash. Publ. 129, 1911. 

 Marchal, El. and Em. Aposporie et Sexualite chez les Mousses III. Bull. 



de l'Acad. roy. de Belgique. CI. des Sciences, nos. 9-10, 1911. 

 Nemec, B. Das Problem der Befruchtungsvorgange. Berlin, 1910. 

 Palladin, work on respiration, Palladin. W. and Stanewitsch, E. Die Abhang- 



igkeit der Pflanzenatmung von den Lipoiden. Biochem. Zeitschr. 26: 



351-369,1910. Palladin, \Y. Zur Physiologie der Lipoide. Ber. d.Deut. 



Bot. Gesell. 28: 120-125, 1910. 

 Pearson, H. H. W. Papers on the Morphology of Welwitschia. Phil. Trans., 



1909. Ann. Bot, 24: 1910. 

 Renner, O. Beitrage zur Physik der Transpiration. Flora, 100: 451-547, 1910. 

 Scott, D. H. Studies in Fossil Botany. 2d ed. London, 1909. 

 Seward, A. C. Fossil Plants 2. Cambr. Univ. Press, 1910. 

 Shantz, H. L. Natural Vegetation as an Indicator of the Capabilities of Land 



for Crop Production in the Great Plains Area. Bur. PI. Ind. Bull. 



201, 1911. 

 Strasburger, E. Sexuelle und apogame Fortpflanzung bei Urticaceen. Jahrb. 



Wiss. Bot, 47: 1910. Uber Geschlecht bestimmende Ursachen. Jahrb. 



Wiss. Bot, 48: 1910. 



Nothing is more noticeable among the assembled replies than the 

 diversity of opinion which they reflect; only four works having been 

 mentioned by more than one man. Of the six men who mentioned 

 Winkler's work four are physiologists and two are morphologists; their 

 nationalities are respectively British, German, Austrian, Japanese, 

 and American (2). Of the five men who mentioned Smith's crown gall 

 work one is a pathologist, one an algologist, one a morphologist, and 

 two physiologists; all of them being Americans. Of the two men who 

 mentioned the work of Johannsen one is a physiologist, the other an 

 ecologist; one being Swiss the other an American. The two men who 

 mentioned Coulter and Chamberlain's work on the Gymnosperms are 

 both American morphologists. The personnel of our correspondents 

 offers no other observation more interesting than the fact that no Euro- 



2 Two of the works mentioned were published more than two years ago, but 

 they have not been discarded. 



