SUPPLEMENT 149 



503, 1. n, for Nyctitropic read Nyctinastic 



11. 24-47, f or Certain conclusions . . . this subject, read The measurements 

 made by PFEFFER (1875) and WIEDERSHEIM (1904) teach us something as to 

 the mechanism of this curvature. The distribution of growth corresponds 

 completely with that in thermonastic flowers. In Impatiens parviflora, for 

 instance, a marked growth acceleration on the upper side follows a darkening 

 of the leaf about midday. After a pause, when no growth takes place, an 

 acceleration on the under side occurs about two hours after the darkening 

 begins. If growth on the upper side has placed the leaf in a depressed lie, it 

 is now raised again by growth on the under side, without, however, quite 

 reaching the position it holds in light. That both movements are associated 

 with growth acceleration scarcely requires statement. 



For reasons which we shall soon learn, it cannot be said with certainty, 

 as in the cases of tendrils and the tulip, whether the retrograde movement is 

 due to autotropism or is a more complicated phenomenon. 



11. 52-3, delete [Evidence . . . (1904).] 



1. 54 and P. 504, 11. 3 and 8, for nyctitropic read nyctinastic 



505, 1. 23, after temperature read (about 30 C., KOSANIN, 1905) 



1. 37, after intense light, read After KOSANIN'S (1905) researches there 

 can no longer be any doubt that this is the correct view. 



I. 44, for nyctitropic read nyctinastic 



506, 1. 12, for nyctitropic read nyctinastic ; after movement read (comp. 

 PANTANELLI, 1904, p. 316) 



507, 11. 4, 18, 25, 28, 43, 55, for nyctitropic read nyctinastic 



II. 20-3, for [WIEDERSHEIM . . . conclusion.] read WIEDERSHEIM'S (1904) 

 experiments have, however, shown that the dissimilar results obtained by 

 extirpating half -articulations are due to the unequal severity of the operation. 

 The observations carried out by WIEDERSHEIM still, however, clearly show 

 that the effect described by PFEFFER takes place only in certain cases, and 

 that, too, often very incompletely. 



1. 31, for moderates read leaves 



1. 39, after 506 read and WIEDERSHEIM, 1904, p. 27). 



I. 44, for 1876 read 1875 



II. 48-50, for Whether this ... to determine, read It is not very probable, 

 however, that such a decrease in the resistance to flexion is generally and 

 necessarily bound up with ' day sleep ', for KOSANIN found no change in the 

 resistance to flexion both in the ' day sleep ' induced by high temperature 

 and generally in all thermonastic movements. It must be left for further 

 research to settle whether this is really a point of difference between photo- 

 and thermonasty. 



1. 54, for nyctitropism read nyctinasty. 



508, for nyctitropic throughout read nyctinastic 

 1. 48, after function read (JosT, 1895). 



509, 11. 4, 13, 49, for nyctitropic read nyctinastic 



510, 11. 30-3, for [As a ... movements.] read A recently published work 

 of SEMON (1905) does not settle the question. 



1. 48, after too far, read (comp. also HENSEL, 1905) 



511, 11. 29, 38, 45, /or nyctitropic read nyctinastic 



1. 51, after against cold read ; it may also protect pollen from rain. 



