250 Electricity in Bands of Leather. 
These crescent-shaped areas of the two lobes are connected by a 
continuous tract of dentine, nearly 14 lines wide at the narrowest 
part; and the same tract continues from the middle lobe to the 
Fig. 2. 
hit i 
Four-fifths the natural size. 
posterior; upon the latter it does not widen over the interior, as 
the reflexed inner enamel covers the whole of the crown, except 
ing a narrow space adjoining the posterior enamel. ‘The romi- 
nent points of the crown betwéen the lobes project about half an 
inch; and probably much more in the perfect tooth. 
The fifth and sixth molars (first and second true molars) resemble 
the one described, (except that they want the third lobe, ) and the 
dentine area on the crown of each lobe is much larger. The sixth 
is 34 inches from front to posterior side. The posterior lobe is 
2, inches from the outer to the inner surface, and 1% inches long in 
the line of the jaw. 'The whole distance on the jaw occupied by 
the three teeth is eleven inches. In the largest Palaeotherium, 
hitherto described, the P. magnum, the same teeth occupy a space 
scarcely one-third that of the Missouri animal. 
- St. Louis, Dee. 10, 1846. 
Ant. XXVIIL—Observations upon the Development of Elec 
tricity in Bands of Leather ; by Joun M. BarcuEe.DER. 
Havine had an opportunity to examine the electrical condition 
of the bands of a cotton mill, and finding them very highly ex 
— many interesting facts were brought out, which I here 
‘The mill is situated on the sea-coast of Maine, where the cli- 
mate is very moist and consequently less favorable for the devel- 
