QUARTERLY CHRONICLE. t57Z 
9. “The Trichina in relation to the Microscope,” by V. 
Hensen. 
10. “On the Generation of Red Blood-corpuscles,” by 
Professor von Recklinghausen. 
11. The journal concludes with a number of short essays 
by Professor Max Schultze, which are each of considerable in- 
terest ; that on “‘ Reichert and the Gromia,”’ and “ Researches 
on Noctiluca,”’ in which hyperosmic acid has been made use 
of, appear to be well worth attention. The last is on the 
* Anatomy and Physiology of the Retina.” 
Muller’s Archiv. May, 1866.—There are the following 
microscopical papers in this journal : 
“ On Redia and Sporo-cysts of Filippi,’ by G. R. Wagener. 
“ On the Extension of Nerve-fibres into‘the Epithelium of 
the Horn-skin,” by Professor H. Hoyer. 
“ Remarks on Max Schultze’s Article, ‘Reichert and the 
Gromia, ” by C. B. Reichert. 
“ Remarks on Dr. H. Landois’ Essay ‘ On the Development 
af the Cluster-formed Spermatozoa in the Lepidoptera,” by 
H. Meyer. 
FRANCE.—Comptes Rendus.—“‘ On the Perforating Bryozoa 
of the Family Terebriporide,’ by P. Fischer.—This is a 
paper of considerable interest. The existence of perforating 
animals has been ascertained in nearly all the classes of 
Invertebrata, Mollusca, Annelida, Hchinodermata, Spongi- 
aria, &ec. The vegetable kingdom likewise presents us with 
examples of Protophyta hollowing out their residence in shells 
and stones. Perforation, and consequently the destruction 
of the perforated bodies, are, therefore, the effects of a great 
law of nature. By the side of the creatures which accumu- 
late masses of calcareous polyparies, and of those of which 
the shells strew our shores and cover the bottom of the sea, 
nature has placed other organisms, smaller, but not less 
powerful in their effects, which restore to the ocean the 
elements which have been drawn from it. 
Among the Bryozoa the existence of terebrant cells is 
almost a new fact. It was known that some Lepralie and 
Cellepore slightly alter the surface of the shells to which 
they attach themselves; but before the discovery of Alcide 
d’Orbigny no one had ever seen them lodged in the very 
interior of the shells. The agents by which the perforation 
is effected are still unknown to us. We have been unable to 
detect siliceous corpuscles in the excavations of the Terebri- 
pore, a circumstance which of itself would suffice to distin- 
guish them from the terebrant sponges (Cliona, Thoosa), even 
if their organization were not infinitely superior. Until we 
VOL, VII.--NEW SER. M . 
