98 
development in both lee they are, it would seem, in a 
different condition. he cause of this, however, is nr ees 
of explanatio: Plants, and el plant, 
re never under precisely the same conditions on an 
secutive days for the reason that t nM ped under 
growth are constantly varying in intensity and the optimum for 
any one, and more especially for the proper balance of them all, 
is scarcely maintained for any length of time. 
Te i » temperature , moisture and ventilation, etc., con- 
oe. 
S ff e 
growth of the different sets, when tested for susceptibility to 
burning by erect The measurements given are in cen- 
timeters. 
