ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
55 
bast-cells are more numerous and larger, especially on the tangential 
walls. In the other type, the transport is effected chiefly through 
mestom-bundles, sometimes through special cortical bundles, or by 
means of thin-walled parenchyms-cells ; the bast-cells have but few and 
small pores. 
Distribution of Laticiferous Tissue in the Leaf.* * * § ' — Dr. D. H. Scott 
gives the result of observations on the course of the laticiferous tubes 
in a number of plants belonging to the Euphorbiaceae, Artocarpaceae, 
and some other natural orders. In the various species of Ficus no con- 
stant relation could be detected between assimilating and laticiferous 
tissue ; but in some leaves the laticiferous cells appear to traverse all 
the tissues equally. It seems most probable that the laticiferous tubes 
are related functionally, as well as anatomically, to the secretory sacs of 
other plants. 
Influence of the Symmetry of the Stem on the Fibro-vascular 
Bundles.f — Herr O. Liguier attempts to show that the course of the 
vascular bundles in the stem depends on the position of the leaves, 
because each bundle originates independently of the next at the base of 
the young rudiment of the leaf, and developes from above downwards 
as the internode increases in length. The lower end of the bundle then 
unites with the bundle-system of the internode next or next but one in 
age, applying itself laterally to an older bundle when the phyllotaxis is 
spiral, or forking when the phyllotaxis is vercicillate, each fork uniting 
with a lateral bundle. 
Anatomy of the Mulberry.^ — Prof. A. N. Berlese describes in detail 
the anatomical structure of the wood of Morus nigra, the present instal- 
ment being devoted to the root and the passage from root to stem. The 
root belongs to Janczewski’s fourth group, in which the extremity of the 
central cylinder passes insensibly into the cortical zone, and the cortical 
zone into the cap, by means of a group of common initial cells. The 
peculiar excrescences of the root are described as being filled with a 
violet tissue which has been regarded by some writers as a mass of 
parasitic fungi, but which has been clearly shown to be the result of 
hypertrophy of the lenticels generated in the suberous tissue of the root. 
Stem of Phytocrene macrophylla.§ —Herr B. L. Robinson describes 
in detail the peculiarities of the anatomy of the stem of this tree from 
Java, and especially of the peculiar wedges between the bast-j^lates, 
characterized by their looser and softer texture, and by the presence of 
tracheides, and of the very large vessels composed of short cells. 
Increase in thickness of the Stem ofAbrus precatorius.|| — Herr 
J. II. Wakker describes the abnormal mode of increase in thickness of 
the stem in this plant, which he regards as belonging to Van Tieghem’s 
group characterized by the possession of tertiary fibro-vascular bundles 
* Ann. of Bot., iii. (1889) pp. 445-8. Cf. this Journal, 1888, p. 72. 
t Bull. Soc. Linn. Normandie, ii. (1889) 15 pp. See Bot. Centralbh, xl. (1889) 
p. 114. 
X Atti Soc. Veneto-Trentina Sci. Nat., x. (1889) pp. 256-73 (2 pis.). 
§ Bot. Ztg., xlvii. (1889) pp. 615-57, 661-72, 677-86, 693-701 (1 pi. and 1 fig.). 
11 T. c., pp. 629-38 (1 pi.). 
