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Joseph Henry. A465 
13. Original experiments on and exposition of the principles 
of acoustics, as applied to churches and other public buildings 
14. Experiments on various instruments to be used as fog 
signals. 
5. A series of experiments on various illuminating materials 
for light-house use, and the introduction of lard oil for lighting 
the coasts of the United States. This and the preceding in his 
office of Chairman of the Committee on Experiments of the 
Light-House Board. 
16. Experiments on heat, in which the radiation from clouds 
and animals in distant fields was indicated by the thermo-elec- 
trical apparatus applied to a reflecting telescope. 
17. Observations on the comparative temperature of the sun- 
spots, and also of different portions of the sun’s disk. thes 
experiments he was assisted by Professor Alexander. 
18. Proof that the radiant heat from a feebly luminous flame 
is also feeble, and that the increase of radiant light, by the in- 
troduction of a solid substance into the flame of the compound 
lowpipe, is accompanied with an equivalent radiation of heat, 
and also that the increase of light and radiant heat in a flame 
of hydrogen, by the introduction of a solid substance, is attended 
with a diminution in the heating power of the flame itse] 
19. The reflection of heat from coneave mirrors of ice, and 
its application to the source of the heat derived from the moon. 
0. Observations in connection with Professor Alexander, on 
the red flames on the border of the sun, as observed in the 
annular eclipse of 1838. 
Experiments on the phosphorogenic ray of the sun, from 
which it is shown that this emanation is polarizable and refran- 
gible, according to the same laws which govern light. 
to the philosophical hall in the attic, on which was screwed 
firmly a rude imitation of a fiddle at the top near the ceili 
while to the other end negro Sam bad a real fiddle attach 
