156 T. C. Mendenhall on the Sensorium. 
the hands of Huggins, Secchi, Young, and others, the spectro- 
scope, that marvel of modern science, has yielded satisfactory 
testimony not only in regard to such stars as are reached by our 
unassisted vision, but even respecting the ete nebule, 
apparently on the outskirts of the visible crea A detailed 
account of these wonderful achievements ae not compat 
our present purpose. Such results, however, as bear 
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was but recently believed, oe remote sidereal clusters; 
but their light undoubtedly emanates from matter in a gaseous form. 
orm. 
4. The spectroscopic analysis of the light of several comets 
reveals a constitution similar to that of the gaseous nebule. 
The spectroscope, then, has demonstrated the present existence 
of immense nebulous masses, such as that from which La 
supposed the solar system to have been derived. It has shown, 
moreover, @ progressive change in their sires structure, 2 
accordance with the views of the same astronom In short, 
the evidence afforded by spectrum analysis in Padé of the neb- 
ular hypothesis is cumulative, and of itself sufficient to givé 
this celebrated theory a high degree of probability. 
tienen i % 
XXII.— Experiments on the time required to communieale : 
grein ref to the Sensorium, and the reverse; by T. ©. MEN 
DENHALL, Columbus, Ohio. 
I PRoposE in this paper to give : few of the results of somé 
experiments, carried bur during the last fall and winter, i 
Us 
* Monthly Notices of the R. A. S, yol. xxv, p. 156. 
