54 Peat bed beneath Drift in Southwestern Ohio. 
upon the system by means of a plate of glass with parallel sur- 
faces inclined to the axis of the microscope at a convenient 
angle and placed between the objective and the plano-convex 
,lens. In this manner the rings are seen with great distinctness 
and news and the arrangement is particularly compact and 
conveni 
The intaeienslik bands of Talbot afford a method not merely 
of observing with great precision the inequalities of surface and 
want of parallelism of the faces of plates of glass, but also of 
eee coral ays ne obtaining a permanent chart 
of the glass whic e of material assistance in correcting 
at fom S It is ony ewes for this purpose to place the 
‘pee near to the object glass of the collimator 
faces, 
produce curvature or distortion of the bands, and, if the eye- 
piece of the observing telescope be removed, the i image may be 
received on a sensitive sees and photogra shed. The number 
Cambridge, May Ist, 1870. 
Art. VIIL—On the Occurrence of a Peat bed beneath oo of 
Drift in Southwestern Oleg 
A BED of peat has lately been found one mile east of Ger- 
mantown, Montgomery county, Ohio, and twelve miles west of 
south ayton—in the occurrence ~ connections of which 
goodie are several facts of unusual intere ; 
