MAMMALIA. 7 
Osteographie, &c. Par M. Ducrotay de Blainville. Paris, 
Since 1840. 
The tenth and eleventh are now added to the nine earlier numbers, 
the divisions comprising Mmtela and Viverra. 
Todd’s Cyclopaedia of Anatomy and Physiology. Lond. 
Since 1839. 
Seven numbers of the third volume, parts 19-25, have appeared. 
Among the articles of its more general contents, may be here particularly 
mentioned — Mammalia by Owen, and Mammary Glands by S. Solly. 
Neue Untersuchungen aus dem Gebiete der Anatomie und 
Physiologie. Von F. J. C. Mayer. Bonn, 1842. 
The Essays pertaining to our Report, are, — 1. The Bursa Pharyngea 
of the Mammalia : 2. The Anatomy of the Marswpialia : 3. A Peculiar 
Organ in the Tongue of Man and the Mammalia : 4. A peculiarity in 
the Structure of the Tongue of the Armadillo. Nos. 2 and 4, will after- 
wards be more particularly mentioned. 
Nasmyth has laid before the Paris Academy, an Essay on 
the Microscopic Formation of the Teeth (Compt. Eend. xv. 
p. 678) ; on which Dutrochet, Flourens, and Serres, have given 
in a report. (Ibid. p. 1055). 
The authors of this report agree with Nasmyth, that the (cartila- 
ginous) fundamental substance of the ivory, and the enamel of the teeth, 
is composed of cells ; on the other hand, they differ from him with regard 
to the tubes, said to bear calcareous matter in the substance of the ivory, 
and which he considers as fibres, while they have convinced themselves 
of the correctness of previous observations. On the external surface of 
the enamel, Nasmyth observed a tender cuticle, which the reporters also 
discovered and recognised as a cellular formation. This is, perhaps, the 
same membrane which Erdl described in the Munich Gel. Anz. xv. 
p. 771, as the commencement of caries. 
Traite pratique et theorique d’ Anatomie Comparative com- 
prenant Part de dissequer les animaux de toutes les classes et 
les moyens de conserver les pieces anatomiques. Par H. 
Straus-Durkheim. Paris, 1842, 2 vols. 
The animal structure is not merely described in this book, in a clear 
and comprehensive style, but the manner in which preparations can best 
be made and most durably preserved is also pointed out. In the latter 
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