TRAUMATIC EFFECTS 135 



growth ensues 1 . Townsend found that shortly after the radicle of a seedling 

 had been injured, the growth of the shoot was retarded, but subsequently under- 

 went a transitory acceleration 2 . In this way it results that there is no difference 

 in size between intact plants and those which have been slightly injured 3 . In 

 the case of the unicellular Phycomyces nitens, it is only natural that the abstriction 

 of a hypha of the mycelium should produce a pronounced retardation in the 

 growth of the sporangiophore, but this effect also soon passes away 4 . 



1 Kothert, Cohn's Beitr. z. Biologic, 1896, Bd. vu, p. 202. According to Scholtz (ibid., 

 1893, Bd. vi, p. 331) the peduncle of Cobaea scandens ceases to grow when the flower-bud 

 is cut off. 



3 Townsend, Annals of Botany, 1897, Vol. XI, p. 509. 



3 Kny, Annals of Botany, 1894, Vol. vm, p. 265. 



* Townsend, 1. c., p. 527. 



