Chemistry and Physics. 477 
- Between Ringgold and Catoosa Station the Chickamauga 
river divides the ridge; the hills to the northwest are called 
Oak Mountains, and those on the southeast Taylor’s Ridge. 
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elegantula, a species common to the Clinton and Niagara group ; 
Cheetetes Lycoperdon, cast from the lower beds : Zaphrentis bilater- 
, There is also a new trilobite, oreo rostrata V odges, from 
the upper arenaceous limestone beds of the Clinton group, Ca- 
toosa Station, Georgia, which will be fully described hereafter. 
It differs from all other species of this genus in having a distinct 
projecting process in front of the glabella. The facial lines 
cut the anterior border at the apex, giving to the frontal limb a 
triangular form; at their juncture the marginal border is raised 
and forms the triangular process which supports the projection. 
SCIENTIFIC INTELLIGENCE. 
I. Ouemisrry AND PHYSICS. 
1. On Electrolysis with Alternating Currents.—Supposing that 
= : - in the living organism are due, 
