Xll CONTENTS. 



Page. 



Salvia sp 171 



Sansevieria Guineensis Willd 171 



Sarracenia purpurea \^ ly-? 



Sarracenia variolaria Michx lyy 



Saururus cernuus \^ lyp 



Sparaxis sp 180 



Solatium tuberosum L i So 



Taraxacum, sp iSi 



Tipularia unifoUa QsiwXW..) B.S.P , 181 



Trillium erythrocarpum Mx 181 



Trillium erect um 'L 182 



Tritelia u?tiJ!ora \^\nd\ 182 



Tulipa patc7is Agardh 1 85 



Tulipa sylvestris L. 1 85 



Vagnera stellata (L.) Morong 185 



Viola obliqua YWW. 186 



Viola rostrata Pursh 187 



Woodwardia radicans Sm 1 88 



Additional Observations. 



Acer riibrum \l 188 



AEsculus Hippocastann7n L 191 



Afios Apios 194 



Tragus Americana Sweet 194 



Ibervillea Sonorae Greene 197 



Lycopodium lucidulum Michx 198 



Smilax Beyrichii Kunth 1 99 



General Considerations. 



Modes of influence of light upon plants 201 



Effect of etiolation on bulbs, tubers, corms and rhizomes 214 



Effects of etiolation on aquatics 215 



Duration of etiolated organs and plants 218 



Effect of darkness on climbing plants 222 



Growth and development of seedlings in darkness 230 



Effect of darkness upon succulents 235 



Etiolation of xerophytes with reduced leaves and spiny or cjdindrical 



stems 238 



Etiolation of stems of woody perennials 239 



Etiolation of stems of herbaceous biennials and perennials 243 



Influence of etiolation on the development and differentiation of the 



tissues and emergences 246 



