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BOTANICAL GAZETTE [OCTOBER 
vernal and estival aspects, only thirteen 
new forms appearing during the aspect. 
It is moreover the aspect of the sod- 
formers, “floral”? forms being represented 
by only six species. Several ruderals make 
their floral appearance in the formation dur- 
ing this aspect but, with the exception of 
Cassia chamaecrista; attain no conspicuous- 
ness. 
The serotinal is markedly a period of 
extremes, bringing about a change to which 
one is generally sensible. During the early 
days of July the weather settles and there 
is a long succession of long and intensely 
hot and dry days, which condition char- 
acterizes the entire serotinal aspect. Relative 
evaporation (table) is at an extreme, though 
slightly less (0.81) than in the estival, find- 
ing its explanation in the lower (0.4) hourly 
wind velocity and higher (8-5) relative 
humidity; the hot dry winds from the south 
and southeast are now coexistent with the 
highest mean temperature, the lowest esi 
daily precipitation, a low relative humidity, 
and a high light intensity. Thus evapora- 
tion and transpiration are augmented to @ 
precarious degree. 
The chresard shows a continued decreas® 
from the estival, being 6.5 per cent. on July 
6 and 4 per cent. on July 24; while the aie 
age chresard is 5.2 per cent., the ie ‘ 
yet reached. The holard of crest ©! 
cent.), 4” 
per cent.), slope (12 per 78) 
base (12.2 per cent.) are now uly sie 
more nearly approximate than 1 
aspects. 
: ;mum and 
Relative evaporation at a maximum 
