234 Address of Prof. DeCandolle 
ance of each function; and as the electric light resembles that 
of the sun, we could in our experimental hothouse submit vege 
tation to a continued light.’ : 
A building such as I propose would allow of light being 
passed through colored glasses or colored solutions, and so prove 
the “ Bibliot erselle de Genéve” (Archives des Sciences), Nov. 
Af the en constructed, the da their construction are, at 
ie ed throughout our books. I will cite, for instance, th wth of 2 
e gro 
scape of Dasylirion, as observed by M. Ed. Morren (Belgique Hortic., 1865, p. 322). 
The figures there given are not favorable to the accepted notion, that the growth of 
paratus which produces the a persistent and vivid light is the mag 
achine, i ism, as dis- 
the 
gine of low power, which sets in motion a whee 
. de G Ar Scientif., 1861 
machine is inexpensive, but, unfortunately, 
tem has already been applied to two light 
to that of the “ Société I’ Alliance,” 
of MM. E. Becquerel and Tresca, 
Bp es ihe 
