C. Dewey on Caricography. 69 
Finally, if the original constitution of the Solar and Saturnian 
Systems was such as we have supposed, can any probable reason 
be given why the satellites of Jupiter should be found an ex- 
ception ?* It may be worthy of remark that if these bodies, or 
the rings from which they were derived, were originally double, 
the proximity of the members was such that they might be 
brought into collision by perturbation, while in the gaseous 
state. e ratio, moreover, of the ascending series of intervals 
is considerably less than in the case of Saturn, and much 
than in the primary system. 
Art. X.—Caricography ; by Prof. C. Dewey. 
(Continued from vol. xxxv, p. 60, 1863.) 
No. 281. Carex conjuncta, Boott, lust. No. 282. 
—— vulpina, Sullivant, Carey, Dewey. 
important and distinguishing, even when, as in this case, the 
characters taken from the inflorescence are so nearly the same. 
* For some suggesti in regard to Mercury, see this Jour. for July, 1864, p. 18, 
