324 Scientific Intelligence. 
faint sounds were o rom chloroform and bisulphide of 
carbon which are diathermanous. It was found that it was the 
vapor and not the hich is effective in produc 
8 In ge th ower of vapors to produce musical 
ounds. : 
sounds can be accurately expressed by their ability to absorb 
powerful musical sound. The method is then enlarged upon as a 
very delicate one to test the athermancy or diathermancy of gases 
and vapors. In a subsequent communication to the Royal Society, 
Professor Tyndall renews his enquiry into the effect of an inter- 
mittent beam upon aqueous vapor and confirms the results ob- 
tained by him nineteen years ago, and believes these results to be 
in entire disaccord with those obtained by experimenters who 
have ascribed a high absorption to air and none to aqueous va- 
concludes that the vapor of all compound liquids will be found 
sonorous in the intermittent beam, and since he questions whether 
there is in nature an absolutely diathermanous substance he believes 
even the vapor of elementary bodies will be found to be capable 
of producing sounds.—Proc. Royal Society, Jan. 3 and Jan. 10, 
; Poe 
On the tones which arise in a gus as the effect of intermit- 
t radiation.—Professor W. C. RénreEn has also recently 
of experiments by the announcément of Professor Bell’s results 
with the photophone. As the source of heat a Drummond calcium 
disk was rotated the heat rays alternately fell upon the absorp- 
tion tube and were cut off from it, producing thus an intermittent 
effect. The tube was filled at first with air, but no effect coul 
be heard. When, however, coal gas was introduced in the tube a 
very distinct tone was heard resembling the whistling sound pro- 
duc ong 
q 
: 
i 5 
7 
4 
j 
: 
4 
4 
A 
