Camden Institution. 431 
some projecting mouldings ; the term cymatium denotes this group 
of mouldings in all cases; and not, as has hitherto been supposed, 
a particular form of moulding. The entablature in the simplest 
cases consists of architrave, frieze, corona, each with its cymatium, 
and the sima above; in more complex cases there are inserted also 
the denticulus, and the modillion-bund, each of which has likewise 
its cymatium, 
March 21.—A memoir was read by S. Earnshaw, Esq., of St. John’s 
College, ‘* On the Integration of the Equation of Continuity of Fluids 
in Motion;” alsoa memoir by Professor Miller on the Measurement 
of the Axes of Optical Elasticity of certain Crystals. This memoir 
contained various determinations, from which it appears that the 
law concerning the connexion of the crystalline and the optical 
properties of crystals suggested by Professor Neumann, namely, 
that the optical axes are the axes of crystalline simplicity, is false ; 
but that it is true, in many of the cases hitherto examined, that 
one of the optical axes coincides with the axis of a principal cry- 
stalline zone. 
Afterwards Mr. Webster, of Trinity College, made some obser- 
vations on the periodical and occasional changes of the height of 
the barometer, and on their connexion with the changes of tempera- 
ture arising from the seasons and from the condensation of aqueous 
vapour. 
CAMDEN LITERARY AND PHILOSOPHICAL INSTITUTION. 
January 26th.—A very perfect specimen of the Ornithorhynchus 
paradoxus was shown to the meeting, and its peculiarities described. 
Mr. Saxton exhibited a very ingenious and simple piece of ma- 
chinery, by which the rolling of a ship labouring in aheavy sea was 
perfectly imitated. 
Mr. J. de C. Sowerby, F.L.S., in laying before the members some 
cases of fossil shells from the London clay, arecent donation to the 
Institution, suggested a plan for the advantageous arrangement of 
fossils in reference to the strata in which they are found; and pre- 
sented a specimen of an undescribed fossil Nautilus from the green 
sand. 
Mr. Wilson addressed the meeting on the characters of two fine 
skulls of the African* Orang Outang. By reference to the skulls 
of other animals he pointed out the comparative peculiarities of the 
head for the accommodation of the senses of sight, smell, hearing, 
and taste. The extraordinary development of the teeth and jaws 
in the African* Orang, in harmony with the nature of its food, 
* Mr. Wilson seems inadvertently to have transposed these local desig- 
nations: the Chimpanzee ( T'roglodytes niger, Geoff.) is the African, and the 
ordinary Orang Outang (Simia Satyrus, Auct.) the Asiatic animal; the spe- 
cimen of the former recently living in the menagerie of the Zoological 
Society, was brought from the Gambia coast. See our last volume, p. 161, 
aiso p. 72; and vol. vi. p.457. Should the subject require further expla- 
nation, perhaps Mr, Wilson will have the goodness to supply it.—E. W. B, 
