Monthly MlcroscoplcaH 
Journal, Nov. 1, 1869. J 
( 271 ) 
PKOGEESS OF MICKOSCOPICAL SCIENCE. 
The Movement of the Protoplasm in the Cells of Anacharis alsinas- 
trum. — Under this title a very valuable paper of 26 pp. appears, by 
Prof. J. B. Scbnetzler in tbe Archives des Sciences for September 15. 
The author goes into the history of the observations made upon the 
plant, and then details a number of experiments, made with a view to 
determine the different effects produced on the movement of the pro- 
toplasm, by heat, light, electricity, and chemical action. In his 
opinion light and heat have most to do with the motion. The most 
refrangible waves of light have the greatest influence, but heat seems 
to be the all-powerful agency. Electricity has its own action, but not 
an extensive one, while gravity seems to have little or nothing to do 
with it. The author thinks that we have here a marked example of 
the conversion of heat and light into mechanical motion. 
The Structure of Nerve-tissue generally. — A useful review of recent 
labours on the histology of the nervous system will be found also in 
the above journal. It is possibly from the pen of M. Claparede. 
Tcenia cucumerina. — M. N. Melnikow, of Kasan, contributes an 
account of this cestoid to the Archiv fur Naturgeschichte (Heft 1, 1869). 
He gives three figures of the worm, and refers to the labours of Van 
Beneden, Leuckart, and Cobbold. 
The Structure of the Mucous Villi. — Herr Dr. Th. Eimer, of 
Wiirzburg, has contributed a lengthy physiological paper on the 
subject of the absorption of fatty matter by the villi to Virchow's 
Archiv (Band 48, Heft 1). In this he describes the structure of 
these mucous processes, both in fresh specimens and in specimens 
prepared with osmic acid, chromic acid, and other substances. The 
sketches of the structure which he has given are most elaborate, and his 
researches tend to showjthat fats are absorbed through the connective- 
tissue system of canals lying in the mucous membrane. 
The Arrangement of the Outer Nervous Layer of the Cerebrum. — Dr. 
Kudolph Arndt's researches in this structure reveal a complexity of 
construction not dreamed of a few years since. It would be impossible 
to attempt an abstract of his results, which occupy nearly a sheet of 
the journal in which they are published. — Vide Archiv fur Mihro- 
shopische Anatomic^ 5 Band, 3 Heft. Various other papers of import- 
ance on the structure of the nervous system appear in this journal. 
The Anatomy and Development of the Reproductive Apparatus of 
Lymneus. — This is a very interesting and painstaking account of the 
construction and development of the generative system of an air- 
breathing mollusk ; and is illustrated by some very good sketches. 
It does not, however, decide the question as to the well-known 
hermaphrodite gland.— See Siebold and KoUiker's Zeitschrifti, 19 Band, 
3 Heft, issued September 6. 
