ets es . eT ee ee 
fics) Se ee ee 
oF eel es oe 
OSer ee eee 
ee eg 
1897 CURRENT LITERATURE 61 
is true. The following conclusions are also sustained : (1) material con- 
structed in active chlorophyll areas and stored in special organs may be 
transported to inactive chlorophyll bearing organs in some plants in light and 
in darkness, and used in such manner as to allow of the perfect development 
of these organs; (2) the removal of concurrent members in darkness may 
have no effect, may cause an exaggerated development of the petioles, or may 
result in the perfect development of the entire leaf ; (3) it is possible for some 
plants to form perfect leaves in darkness, some when a portion of the stem 
only is darkened, and others when the entire plant is etiolated, thus showing 
that no invariable connection exists between the phototonic condition and 
leaf development; (4) the conclusion of Jost, that pathological conditions 
ensue more quickly in inactive leaves in light than in darkness, is not capa- 
ble of general application ; (5) placing a leaf under such conditions that it can- 
not construct food material sets in motion the specific regulatory mechanism 
of the organism in such a manner that the plastic material may be withdrawn 
and the organ cast off; (6) it is to be noted that plants may not be classified 
upon the basis of species entirely as to their reaction to an atmosphere free 
from CO, since a given plant may be capable of developing inactive leaves 
at one stage of its development, and not at meals’ } Me 
THE GASES produced by certain bacteria wie grown in 2 per cent. sugar 
bouillon have been studied by L. H. Pammel and Emma Pammel,’ of the 
lowa Agricultural College, using Theobald Smith’s fermentation tube. Five 
from 
species were fully studied, of ‘chs a paarnnas: ir cheese gave 
no gas. The production of hydroget <ide from the other speci 
was as ws: 
