1921] CURRENT LITERATURE 335 
one species, paying ee Sige attention to the node. Miss Barratts treats 
several species in a thorough manner, especially the anatomy of sporelings. 
alsos given her attention more fully to the broader aspect of the comparative 
morphology. These students of Equisetum all present convincing evidence of 
great reduction in the vascular tissues. All are of the opinion that the inter- 
nodal ring of vascular bundles represents a more extensive and continuous 
mass in ancestral forms, and believe the three separated xylem strands of 
each bundle to be the remains of one continuous strand, except that Miss 
ARATE considers the protonyiees is eae an independent ae. The 
lL bun 
Leaf gaps do not, cats the gaps in the cone spe have no morphological value. 
Nodes and internodes do not exist in the cone, and the ea eaeer yet are 
organs sui generis. No true secondary growth occurs at the nodal ring.— 
I. W. Bartey 
Ecology.—Although one of the youngest members in the group of bio- 
logical sciences, ecology in America has already passed two conspicuous 
milestones of progress. The first was the establishment in 1915 of the Eco- 
usually supplements its annual meeting in December with a summer gathering 
upon the Pacific Coast. The appearance during 1920 of the four numbers 
constituting the first volume of a journal‘ devoted entirely to the interest of 
ecologists marks the passing of the second milestone. 
The purpose of the new journal is well expressed in the “foreword” con- 
tained in the first number: “This journal is issued to meet the demand for the 
collective publication of articles on ecology. Its pages are open to all who 
have material of ecological interest from whatever field of biology. While 
the variety of fields may cause diversity of treatment, yet the ecological 
significance of the papers will make them of general interest. Specialization is 
inevitable, but makes more urgent the need for cooperation. To approach 
ilar points of view is to lay the foundation of coopera- 
tion.” An examinétion of the first volume shows that all phases of the subject 
are being cared for. This is evidenced by the inclusion of 10 articles dealing 
with the more general aspects or including a discussion of both plants and 
animals, while an equal number deal rather exclusively with plants and six 
tT, Kate, A contribution to our knowledge of the ype system of the 
ean psarnebiay Ann. Botany 34:173-200. pls. 6, 7. figs. 2 
4Brown, IsaBet M. P., A third contribution to our Ciaces ee the veaseend of 
the cone and fertile stem of Equisetum. Ann. Botany 34: 237-263. pls. 8, 9. figs. 7.1920. 
Paints yo considerations on the internodal vascular ok of 
a ‘Ne pela: 11-25. figs. 7- 192 
6 Ecology (contin ee Plant World). Quarterly Journal. BarrincTon 
Moore, ate: Backivn? Botanic Garden, publisher. 1: pp. 313. 1920 
