miscellaneous: experimental teratosis 603 



a series of proliferous leaves and internodes, corresponding to a 

 series of pottings or water-interruptions, separated from each 

 other by leaves and internodes free or nearly free from such 

 shoots. 



24. The normal upward movement of water from roots to 

 shoots being thus interrupted, the water movement will now 

 be from inner parts of the stem toward the surface and especially 

 toward the leaves, and undoubtedly some leaves will transpire 

 more than others, making at times an unequal drain upon the 

 young tissues which will be manifested later by the development 

 of an unequal number of adventive shoots. There will be also, 

 as I have said, an abstraction of food which must move down- 

 ward to repair the roots. That there is often a real shortage of 

 food in the plant at this time is shown by the frequent stunting 

 of the shocked and proliferous leaves. Often, when full grown, 

 although by no means always, the shocked leaf is plainly smaller 

 than the leaves below it or the ones above it (Figs. 430P, 432X, 

 437ikf). Occasionally it is not }^i or }i the size of the next 

 leaf below it or the next leaf above it; although it is generally 

 full of adventive shoots, or pimply with their rudiments. But 

 on the other hand, a very profound phyllomania may occur 

 (many hundreds of shoots developing) on big leaves (Figs. 4322:, 

 440y, 4464) which exhibit no evidences of starvation. I take 

 the starvation and the shock, therefore, to be two distinct things. 

 The shock, in other words, I believe to be of short duration, like 

 that due to the particles of acetic acid water or other substances 

 which start the growth of intumescences on cauliflower leaves, 

 like the crown-gall stimulus which determines the growth of 

 adventive shoots in tumors on internodes of various plants, or 

 like Bataillon's needle prick which starts the unfertilized frog's 

 egg into growth,^ while the starvation, if there is any, extends 



1 Comptes Rendus des se. de I'Acad. des Sci., Paris. 1910, Tome 150, page 966. 

 •Confirmed by Jacques Loeb. Proc. Nat. Acad, of Sciences, vol. 2, 1916, p. 313. 



■Contrast J with K the next leaf above it which is nearly free from shoots. Axis 

 proliferous at R especially on the back side, but very much less so than the leaf J, 

 •or than other internodes shown on these plates. For center of the twisted pro- 

 liferous leaf blade (not shown here) see next plate. Photographed October 1, 

 1918. About }^ natural size. 



B. Cross-section of a petiole-trichome showing the origin of a shoot. X 80 



