1$15.] Mn Essay on Rewils. 213 
rate. No, it is said, the hypothesis of Davy doés fet, consider these 
bodies as subhydro-chlofates. They are composed of thé chlotidé 
of opper or lead, combiied with the oxide of thé samé métal and 
With water, so that for one atom of é¢hloridé there afé three atoiis 
of oxide and fout of water, a composition which agrees perfectly 
with the laws of chemical proportions. But this is a mistake. It 
ae <> cp 9 
ArtioLe IX, 
An Essay on the Shapes, Dimensions, and Positions of thé Spaces 
in the Barth which are called Rents, and the Arransement of the 
Matter in them: with the Definition and Cause of Blratifieation, 
By Mr. Jolin B. Longrivire. 
(Continued from p. 46.) 
I. On Rents. 
1, Additional Remarks on the Positions of the Strata near Bendet- 
Talular Rents, 
I wave before laid it down as a general rule that the distari¢e 
Which the strata are asunder on opposite sides of bended-tabular 
retits is owing to a bending in the strata, which commences at the 
lowest extremities, increases to the middles, then decreases to, and 
endg at, the highest extremities of tliese rents, But, although this 
