)•_' Newcombe, Sensitive Life of Asparagus plumostts. 



shoots revolved on the horizontal klinostat, whilc the shoot retaina 

 iis negative geotropism. 



14. Tbc assumption of the diageotropic position by thc apcx 

 of the shoot cannot bc conditioned by the nnfolding <>f the lateral 

 buds; for, in one of mv seedlings grown in the dark, the plagio- 

 geotropic position was taken by a shool whose buds never nnfolded, 

 and in the case of shoots frorn rhizomes, the shoots in thc dark, 

 temporary plagiogeotropic curvcs were made with no attendant 

 nnfolding of branches. 



15. The assumption of the plagiogeotropic position by seed- 

 lings in the dark, and to a less degree by other shoots never ex- 

 posed to light, has become hereditary. 



16. The presence of light is necessary for the development 

 of circuninutation, and hence for twining. A shoot that has been 

 twining about a support will relinquish twining after the exclusion 

 of light for 3 days. 



17. The biological significance of various behaviors of As- 

 paragus, like the removal of inhibition of elongation of the aerial 

 shoot in the dark, the relinquishing of twining- in the dark, the 

 failure to unfold lateral buds in the dark, and the absence or 

 stunded growth of needles in the dark, may be referred to the 

 conservation of building niaterial. The significance of the bending 

 to the horizontal of the upper third or half of the aerial shoot 

 froni the rhizome and of the seedling may possibly bring the 

 assimilating part of the plant into greater light. 



