296 Scientific Intelligence. 
oe when the head was in its natural, declined position. 
. The malar does not form the middle of the pers — 
18th. The occiput is not vertical, but oblique. 19 t 
and foot are not pr oe in character, strictly, but show strong 
peepee features, e the absence of a hall , and in the 
e. &-, 
rticulation of the pe a with both the navicular and cuboid 
jes 20th. The genus Dinoceras was not originally referred to 
the Perissodactyls, but toa new order. 21st. The name Tinoceras 
was not first proposed August 24, 1872, but August 19, 1872, and 
on that day I mailed Prof. Cope‘ the pamphlet containing it. 22d, 
sca stated. 23d. Many of the erroneous dates and references 
have pointed out (pp. 118, 122, and 135) in Prof. Cope’s 
secant publications remain uncorrected, 
The species of Dinocerata at present known with certainty are 
the following :— Tinoceras av — Marsh, Tinoceras grandis Marsh, 
Vintatherium robustum Leidy, Dinoceras mirabilis M arsh, Dino- 
ceras lacustris Marsh. To these should probably be added Mega- 
cerops eee paride and also Tinoceras cornutus = Hob 
leus corn ope, if this species should eventually prove e distindé 
Yale ae New Haven, March 10, 1873. 
SCLIN CIVIC.IN TELLIGEN © i. 
I. CHEMISTRY AND PuHysics. 
1. Considerations on some Points of the Theoretic Teaching of 
‘Chemistry.—The Faraday lecture before the Chemical Society of 
‘London, was delivered by Professor Cannizzaro, now of Rome, 
upon the above subject. bel tattle among the first of living 
clearest, shortest, most exact and most accessible summary of al 
that relates to the origin, meaning, value and use of empiric cal 
formule and of equations, 7 he naturally concludes that “it ought 
to be introduced into the teaching of chemistry at an early stage. 
“T do not hesitate to assert,” he continues, “that the theory of 
atoms and molecules ought to play in the teaching of chemistry, 4 
part = to that of the theory of vibrations in the teaching. 
of optic Affirming that “the solid base, the corner stone 0 
the iio theory of molecules and atoms, is the theory of 
Avogadro, Ampére, Krénig and Clausius on the constitution of 
— gases,” he would “found on this theory the demonstration 
* This Journal, vol. ii, p. 35, 1871. 
