ZOOLOGY AN D BOTANY, MICROSCOPY, ETC. 
613 
or whether it is the expression of physical forces which, at correspond- 
ing periods, operate under similar conditions. 
Multiple Nuclear Division.* * * § — Herr E. Krompecher maintains that 
multiple division is an undeniable normal occurrence, especially in 
highly nourished cells. Binary division, apparently occurring along 
with multiple division, is an illusion due to misinterpretation of sections; 
the triaster is often only the section of a 4-, 6-, or 12-division, and so 
on. Division may be linear (binary), in a plane surface (ternary), in 
three dimensions (multiple). The nucleus may divide into from two to 
twenty parts, but always definitely and regularly. 
Accessory Nuclei in Cells of Larval Salamander.f — Dr. Hs. Rabl 
has observed, in various tissues (epithelial, cartilaginous, connective, 
<fcc.) of a larval salamander, the constriction of an accessory nucleus, or 
of several from the main nucleus. The occurrence is doubtless abnormal, 
but is of interest as an example of cellular variation, and in connection 
■with amitosis. 
Paranuclear Body in Blood-Celis4 — Hr. L. Bremer describes in 
nucleated erythrocytes of Vertebrates the general occurrence of a para- 
nuclear corpuscle. It is a small spherical body, lies near the nucleus 
from which it seems to arise, and consists of an unstainable sphere with 
a minute stainable centre. It occurs in Fishes, Amphibians, Reptiles, 
and Birds, but the author has not succeeded in detecting it in the 
nucleated erythrocytes of the Mammalian medulla. 
PIasma-Cells.§ — Prof. W. Waldeyer distinguished in 1875 a type of 
connective tissue-cells characterised by the abundance of protoplasm. 
He called these cells plasma-cells, and united them with others (in the 
intermediate substance of the testis, in sweat and carotid glands, in 
adrenals, corpus luteum, and decidua) under the category of perivascular 
tissue. Unna has recently applied the same term “ plasma-cells ” to 
elements which occur in many pathological processes in the skin. In 
what sense should the term be now used ? 
Waldeyer’s plasma-cells correspond in staining reactions to Ehrlich’s 
Mastzellen , but not to Unna’s “ plasma-cells,” and Waldeyer proposes 
to give up his use of the term as applied to normal elements of connec- 
tive tissue. The cells he described as “ plasma-cells ” are Ehrlich’s 
Mastzellen and eosinophilous cells. 
Eosinophilous Granulations of the Blood.]| — Herr N. SacharofT finds 
that the eosinophilous granulations of the blood in Birds and Mammals 
always arise from the phagocytosis of nuclear elements which have fallen 
out of erythrocytes or haematoblasts. These elements consist of para- 
nuclein (round granulations), or of degenerated nuclein (rod-like 
granulations). 
Minute Structure of Nervous Tissue.f— Dr. E. Rohde’s general 
conclusions are briefly as follows : — The spongioplasm in ganglion-cells 
* Verh. Anat. Ges. IX. Vers., x. (1895) pp. 52-62. 
t Arch. f. Mikr. Anat., xlv. (1895) pp. 412-33 (1 pi.). 
X Tom. cit., pp. 433-50 (1 pi., 2 figs.). 
§ SB. K. Akad. Wiss. Berlin, 1895, pp. 751-8. 
II Arch. f. Mikr. Anat., xlv. (1895) pp. 370-87 (1 pi.). 
1 Tom. cit., pp. 387-412 (1 pi., 3 figs.). 
