262 Scientific Intelligence. 
example, recent yg apa by the different methods of Thom- 
sen and Farmer, fix the echanical equivalent of light, in a wax 
candle burning 1261 ais per hour, at 13-1 foot-pounds per min- 
olive oil in oxygen : oe oy to heat 9862 grains of water 
1° C, According to axe re and Silbermann, | grain of oil of tur- 
Ce burned in oxygen, would heat 10, 852 grains of water 
3 
It may therefore ye presumed that the total heat given out by 
the Zopneeeen of 1 grain :3 wax, is about sufficient to raise 
10,000 grains or water 1° C., or 18,000 gr. 1° F, This a 
a alerted! equivalence of (18, 000 xX 772 + 7000 =) 19 
foot-pounds, which is 319°5 times as great as the corresponding 
equivalent of the light given out during the combus 
dall, in his lecture on Radiation, states that a abla rays 
of the electric light contain about one-tenth of the total radiated 
heat. The relative luminous intensity of an electric lamp would 
a appear to be about 32 times as great as that of the wax 
andle. This ratio so nearly resembles that of solar to terrestrial 
puperdcial attraction, and the connection of electric and magnetic 
currents with solar radiation is so evident, that additional experi- 
f 
sirabl 
n the present eae may be acci nb the numerous har 
render Bs at least oka possible that it ink have a weighty sig- 
nifican 
II. GEOLOGY AND MINERALOGY. 
1 Ona rag Tooth from Table Mountain ; by Pro £ Wu 
LiaM P. BLaxs. (Communicated by the author for this Jour fat — 
Tab 
army and compared vik specimens in the Smithsonian Insti- 
. It proves es be a ower molar of an equine animal of 
sie ‘genus ipparion, or a t oly allied genus, This genus is 
one tg the connecting links between the Paleotherium and the 
The specimen closely resembles a fossil in the Smithsonian mu- 
seum, from the Pliocene formations of the Niobrara river in Ne- 
braska,* not only in size but in the foldings of the enamel, and 
particularly in the posterior part of the tooth, but it differs enough, 
in several particulars, to justify the belief that it is a distinct spe-_ 
cies. ae Leidy does not attempt to determine, specifically, the 
specimen from Nebraska, but considers it closely related to, if not 
identical specifically with, Hipparion gratum, possibly Protohip- 
pus placidus. 
* Described by Prof. oar | - his work upon the Extinct Mammalian Fauna of 
that region, p. 319, pl. xix, 
