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1905] CURRENT LITERATURE 379 
mental evidence obtained by the author, which establishes that the latex partici 
pates very little, if at all, in the translocation of nutrient substances. Seedlings 
subjected to conditions intended to force an exhaustion of storage products showed 
no difference as to quantity or form of starch grains in the latex as compared with 
controls. The author does not regard the latex starch of the euphorbias with 
which he experimented as a typical storage product. ScHIMPER’s results th 
the latex tubes of the euphorbias do not participate in the depletion of carbo- 
hydrates is verified. The third section comprises an anatomical study of thirty- 
six species distributed in seven families of laticiferous plants. DrBary’s view 
that latex tubes and sieve tubes are reciprocal tissues is rejected. The opinion 
of HABERLANDT that latex tubes function as translocation parenchyma is also 
discredited. The final section presents an ecological view of the problem, and 
exudation of latex, and protection against animals secured by presence of poison- 
ous, acrid, or ill-smelling substances. That the problem remains unsolved, and 
that the chief value of his paper consists in formulating the present status of 
investigation as well as in seit, promising lines of research, is fully realized 
by the author.—Raymonp H. 
Mitosis in the salamander (Salamandra maculata) has been investigated by 
Kowatski’8 under the direction of GREGOIRE. The object of the investigation 
was to compare typical animal mitoses with the mitoses in the roots of Trillium 
as described by GREGOIRE and WycaeErtTs (see Bot. GAZETTE 38:396. 1904). 
Mitosis was studied in various tissues, but principally in the epithelial cells. In 
general it may be said that even in minute details the structures and the sequence 
of events are essentially the same as in Trillium. In the telophase the action of 
the nuclear sap outside the chromosome results in the production of anastomoses 
tween the neighboring chromosomes and between parts of the same chromo- 
some; while the action of the sap within the chromosome brings about an alveolar 
and reticular structure. Each chromosome forms a network of lamellae and 
ents of various shapes and sizes which cross each other in every direction. 
The entire chromatic network of the nucleus is made up of the individual networks. 
The behavior of the chromatin in the prophases is strong evidence in favor of the 
individuality of the chromosome. ‘The longitudinal splitting of the chromosome 
is not due to the bipartition of a series of chromatic disks imbedded in a sub- 
stratum, but consists simply in the longitudinal cleavage of a chromatic ribbon. 
No disk spirum is formed at the telophase, nor is any spirem formed at the pro- 
Phase. The nuclear membrane is formed by the condensation of the cytoplasm 
bordering upon the nuclear vacuole, and at its formation no cytoplasm is included 
within the nuclear cavity.—C. J. CHAMBERLAIN. 
ee 
28 KOWALSKI , J-. Reconstitution du noyau et formation des chromosomes dans 
les cinéses somatiques de la larve de Salamandre. La Cellule 21:349-377- pls. I-2 
1904. 
