444 BOTANICAL GAZETTE [MAY 
specimens from the following collections: K. Pr. Geol. re Berlin; 
Stidt. Museum, Chemnitz; Naturw. Museum, Dortm SR Ged: 
Reichsanstalt, Wien; Murkisches Museum, Witten; ican Oanadri ck; 
s’Rijks Herbarium, Leiden; Geol. Institut der Universitat, Gottingen; Geol. 
Institut der Bergakademie, Clausthal; and Geol. Institut der Universitat, 
Miinster i.W. 
The work is strictly taxonomic. The descriptions and synonomy are very 
complete, and the magnificent plates enable one to study the subject almost 
as well as if he had the actual specimens in his hands.—CHARLES J. CHAMBER- 
LAIN. 
Anatomy of petioles of Cycads.—Lr Goc” has studied the debated xylem 
situation in the foliar bundles of the cycads. As is well known, both centrip- 
etal and centrifugal xylem occur, a situation which has been variously inter- 
preted, but in general the bundle has been spoken of as mesarch. LE Goc has 
found that at the very base of the petioles in cycads the xylem is entirely cen- 
trifugal, and that later the bundles assume different forms, becoming con- 
centric, collateral, or a combination of these two arrangements. He regards 
the centrifugal xylem at the base as a secondary growth, and the centripetal 
xylem which appears later as a primary structure, laid down early, but only 
two one remain ames and therefore he would suggest that the bundle 
is more properly called “‘pseudo-mesarch.”’—J. M. C. 
The origin of the “eye spot.”—From a study of the literature, without any 
apparent study of the structures themselves, ROTHERT™ comes to the conclu- 
sion that the “eye spot” of flagellates and algae is derived from a plastid. 
The evidence seemed clear already, so far as the Pupuerene are concerned, 
and GUIGNARD, as long ago as 1880, claimed that the “eye spot” seen in the 
sperms of Fucus arose from a colorless plastid. RoTHERT overlooks entirely 
the various papers by YAMANOUCHI from 1 to 1913, partecey the paper 
on Cutleria,® in which the origin and development of the “eye spot’’-are 
described in detail—C. J. CHAMBERLAIN. 
7 LE Goc, M. f., Berea on the centripetal and centrifugal xylems in the 
petioles of — Ann. Botany 28:183-193. pl. 11. fig. I. 1914. 
RoTHErT, WiaptsLaw, Der “Augenfleck”’ der one und Flagellaten ein 
Chromoplast. “te Deutsch. Bot. Gesells. 32: 91-96. 1914 
ucHI, SHicEo, The life history of Culleria. Bort. GAZ. 54: 441-502. 
jigs. ns pls. 2045 1912. 
