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a'chemical agent. It also enables us to illustrate in our
laboratories actions Which have been hitherto performed
only in the laboratory of Nature. A few of these actions
of a representative character will now be brought before
you; and advantage will be taken of the fact that, in a
great number of cases, one or more of the substances into
which the Waves of light break up a,_____ ____ _ b
compound molecules are compar— ‘ g” """"" "
atively involatile. The products zl- '

' ‘ o e Halt! H. 1W];
of decompos1tlon require a greater will M.



._.__ * “x \

heat than is required by the va—
pors from which they are derived -i

to keep them in the gaseous form; I: | ‘
and hence, if the space in which 5'
these new bodies are liberated be .


of the proper temperature, they
Will not remain in the vaporous
condition, but will precipitate
themselves as liquid particles, thus
forming visible clouds upon the
beam, to the action of which they
owe their existence.

The little flask, F, in the an-
nexed figure, is stopped by a cork,
pierced in two places. Through
one orifice passes a narrow glass
tube, a, which terminates imme-
diately under the cork; through
the other orifice passes a similar
tube, 6, descending to the bottom of the little flask, which
is filled to a height of about an inch with a transparent
liquid. The name of this liquid is nitrite 0f amyl, in every
molecule of which we have 5 atoms of carbon, 11 of hydro:-
gen, 1 of nitrogen, and 2 of oxygen. Upon this group the
waves of our electric light will be immediately let loose.







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