318 BOTANICAL GAZETTE [APRIL 
fruits betray no close relationship with artificial yellow pigments, a large 
number of both being investigated. Rather the plant pigments show alliances 
with the phytosterins. Carotin, he adds, probably is allied to THIELE’s /ulvin, 
and its chromatophore radicles contain a quinate ring of which at least three 
C-atoms have double bon 
VuILLEMrn*! has published a paper on the development and structure of the 
membrane of the zygospore in the mucors. The main contribution of the paper 
is the recognition of the fact that the membrane is more complex than has usually 
been supposed. The author distinguished five distinct layers which differentiate 
successively and differ from each other in thickness, appearance, and in their 
behavior toward reagents. The aay includes Sporodinia, Spinellus, Zygorhyn- 
chus, and Mucor.—H. HAsSELBRIN 
AN INVESTIGATION under the sae of PALLADIN by L. PETRASCHEVSKY*?* 
shows that when Chlorothecium saccharophilum is fed with raffinose its respiratory 
quotient in anaerobic life is raised much above 1 (in aerobic life it is 0.74—0-89); 
while with maltose it falls below the normal. Acids are probably produced as 
oo aga in the former case and alcohol-like substances in the 
latter.— 
Parla in a greenhouse modifies notably the external form, the habit, 
and the structure of plants, according to the experimental studies of BEDELIAN.*$ 
This he ascribes to the humidity, nearly uniform temperature, and the weaker 
diffuse light. In general differentiation is more or less arrested, and there are 
manifested various adaptations to the new conditions.—C. R. B. 
FRIEDEL finds the effect of insufficient oxygen on the anatomy of certain 
plants quite parallel with that of darkness. The relative thickness of the cortex 
is increased, that of the pericyclic region is diminished, and lignification is incom- 
plete.44 The experiments, however, cannot be continued long enough to make 
these effects as marked as in etiolation.—C. R. B 
KeLticorr‘s finds in roots of Allium and Podnplepthain two maxima (c. rand 
_ 1 P.M.) and two minima (c. 7 A. M. and 3 P.M.) in cell division, which are not 
affected by slight variations in temperature, but are affected by solutes in ne 
water. Elongation maxima and minima in Allium coincide respectively 
minima and maxima in cell division. —C. 
4t VUILLEMIN, P., Recherches morphologiques et morphogéniques Sur la mem- 
brane des zygospores. Ann. Mycol. 2:483-506. pls. 8-II. 1904- 
42 PETRASCHEVSKY, L., Ueber Atmungscoefficienten der einzelligen Alge ail 
thecium sacchara sibs. Ber. Deutsch. Bot. Gesells. 22:323-327- 1994 
43 BEDELIAN, J., Influence de la culture en serre sur quelques plantes ee 
de Paris. Rev. Gén. Bot. 16: 318-336. pls. I0-13. 1904- 
44 FRIEDEL, JEAN, Influence d’une faible pression d’oxygen 
anatomique des plantes. Rev. Gén. Bot. 16:305-317- 1904- 
48 Ketiicott, Wm. E., The daily periodicity of cell division and 
the root of Allium. Bull. Torr. Bot. Club 31:529-550. figs. 8. 1904- 
e sur la structure 
of elongation " 
