38 C. Dewey on Caricography. 
to ae descent from the increased density of the air; for it is 
an established fact that, aes atmos Rees strata of equal 
epth, the increase of density ions is by a geometrical 
ratio. In order however to account for a separation of over 
miles in a vertical line it is necessary to concede that the part 
which passed over was much larger than any of those which 
came to the ground. It must also be conceded that they began 
to separate long before crossing the Ohio river: a view which is 
strongly supported by the fact already stated, that over the 
southern part of Noble county the stones which fell had already 
comet far enough to cause a concussion in the lower atmo- 
sphere that was heard over a vast regio 
For other particulars of the history of this remarkable fall of 
stones, and for a chemical analysis of some of the specimens, the 
reader is referred to this Journal for J uly, 1860, and January 
1861. 
Marietta, Ohio, May 1, 1861. 
Art. VITl.—Cuaricography ; by Prof. C. Dewry. 
(Continued from vol. xxxi, p. 26, Second Series, 1861.) 
No. 271. Carex Norvegica, Wahl. Schkuhr, Car., fig. 66. 
- Spica oblonga composita; spiculis 3-5 brevi-oblongis sessilibus andro- 
nis infirne staminiferis remotiusculis sub-densifloris, ¢ et infima squamoso- 
racteata cum bractea longa-setacea; fructibus distigmaticis ovatis vel 
oblongis ellipsoideis subacutis ore integris apiculatis squama late-ovata 
subacuta paulo longioribus vel subaequantibus. 
Culm 6-10 inches high, erect, leafy below, an, than the leaves; 
spikelets 3-5, Sioage short, sessile, staminate at the base, a little sepa- 
below, a setaceous and rough bract supporting the lowest and rising 
from an ovate scale; stigmas two; fruit ovate, oblong or ellipsoid, some- 
what acute and apiculate with entire orifice, slightly compressed, longer 
than or equalling the ovate, short, broad and acutish scale. 
Long known on the sea-shores of Norway, it was discovered in 1860 
at Wells, Me., in marshes, near the ocean, and forwarded to Dr. Sartwell 
re Rev, J. Blake, thus bahig first detected in our country. 
; Fe 272. C. Franklinii, Boott, in Hook. Fl. Am. Bor., 217, Illust., No. 193. 
‘Spica e joel multis diversis fuscis composita ; spiculis 6—10, superne 
aggregat is quatuor vel pluribus sessilibus nunc ovatis oblongis nunc lin- 
_earibus gracilibus, suprema apice staminifera, proximis toto staminiferis 
