MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



103 



included 6 etiolated leaves, i c.c. of water was taken up in 24 

 hours in the dark room at a temperature of 16-18° C. A shoot of 

 a normal plant with seven leaves, 

 the whole having a volume of 2 

 c.c. used 2 c.c, or its owm volume 

 of water in 24 hours at a temper- 

 ature of 18 to 20° C. in diffuse 

 daylight. (See Fig. 57.) 



Equisetum arvense L. 

 A number of bulb-bearing un- 

 derground stems of Eqisetum ar- 

 vense were placed in a dark room 

 in January, 1900, and a month 



Fig. 57. 

 exaltatum. 



Etiotated shoot of Delfkinium 



II I 



Fig. 58. I, normal joung vege- 

 tative shoot of Equisetum arvense. 

 II, etiolated shoot. 



later two sporophytes and a number of 

 vegetative shoots were to be seen. The 

 latter developed only a small number of 

 branches to a length equal and greater 

 than the normal, the remainder attaining 

 a length of a centimeter or two, and the 

 whole shoot showed some attenuation. 

 In only two instances out of 40 under ob- 

 servation did these branches give rise to 

 branches of the second order. The vege- 

 tative shoots perished within sixty days, 

 which may have been due to defective 

 cultural conditions. (See Fig. 58.) 



