640 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Uvaria , and Poliantlies tuberosa. The individual crystals are fewer and 
larger than in an ordinary bundle, and are destitute of a mucilage- 
sheath. 
Coagulation of Latex.* * * § — Mr. R. H. Biffen describes the mode of 
coagulating the latex in several species of rubber-producing plants, and 
the evidence afforded of the existence of a proteid constituent, whether 
acid or alkaline, as well as of globulins, albumoses, and peptone. 
Reserve-Material in Deciduous Trees.f — Mr. E. M. Wilcox gives a 
preliminary account of his researches into the changes which occur 
during the dormant period in the reserves of trees. He has studied the 
changes from October to March in about twenty-live species of trees, and 
finds there is a general movement of the starch from the peripheral to 
the deep-seated portions of the stem in winter, and a reversal of the pro- 
cess in spring. 
(8) Structure of Tissues. 
Comparative Anatomy of the Cycadese.J — Mr. W. C. Worsdell 
gives the following as the general results of his study of the comparative 
anatomy of certain genera of Cycadem. 
“ In Cycas the conduplicate vernation and arrangement of the bundles 
in the fleshy hypogseal cotyledons, the secondary extrafascicular rings, 
the concentric cortical strands, and, in one species, the peculiar concen- 
tric structure of the leaf-traces in the stem, and in the hypocotyl some 
curious concentric strands running obliquely out from the cylinder, and 
in a small seedling, the secondary vascular cylinders lying outside the 
normal stele ; in the seedling of Stangeria paradoxa the small primary 
concentric bundles in the stalk common to the two cotyledons, which, 
both higher up and lower down, become collateral, and in the adult stem 
the occurrence of a secondary concentric strand in the periphery of the 
cortex ; and, in Ceratozamia mexicana, the vert : cal succession through the 
pith of a large stem of effete peduncular cylinders, the peduncles which 
occasionally terminate the stem being in turn pushed to one side and 
their basal region enclosed, by a lateral shoot which continues the main 
vegetative axis.” 
From these characters the author draws the conclusion that the 
Cycadeae are nearly allied to certain fossil fern-like plants, notably the 
Medullosse. The species examined were Cycas revoluta, C. media , Macro - 
zamia spiralis , Ceratozamia mexicana , and Stangeria paradoxa. 
Anatomy of the Hemp § — Sigg. G. Briosi and F. Tognini describe 
in great detail the structure of the vegetative organs of Cannabis sativa. 
Among the more important points brought out are the following. In the 
stem there was found, in the interior of the xylem portion of the vascular 
bundles, a string of phloem-tissue, not containing any sieve-tubes, which 
they call “ internal pseudo-liber ” and regard as a retrogressive or 
undifferentiated phloem. In the root the results obtained by the authors 
differ somewhat from those of Van Tieghem and Douliot. In the 
* Ann. of Bot., xii. (1898) pp. 165-71. 
t Amer. Journ. Sci., vi. (1898) pp. 69-74. 
% Journ. Linu. Soc. (Bot.), xxxiii. (1898) pp. 437-57 (1 pi.). 
§ Atti 1st. Bot. Univ. Pavia, iv., 175 pp. and 26 pis. See Bot. Centralbl., 1898, 
Beib., p. 27. 
