Dynamoscopy.— Artificial Caoutchouc. 255 
Dr. Collongues, examines these sounds in case of a deceased person with 
an instrument with one extremity on the part to be ausculted and th 
other at the ear. It is with this instrument that Dr. Collongues sup- 
poses he is able to detect the evidence of actual death. 
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about the precordial and epigastric regions. 
The results have been confirmed by observations on animals. It lence 
results that life continues until the cessation of this sound has ¢ 
and the cessation is a positive sign of death. This observation offers a 
agi of distinguishing lethargy from death, as the sound does not cease 
ethargy, 
general twice as numerous as those of man. There is also a great differ- 
ence for different temperaments, and for different seasons and climates, 
singular experiment made with the instrument is to hear a faint and 
aan asleep, whilst when awake there is only a great 
bourdonnement.” Dr. Collongues supposes that these sounds have 
i seat in the nerves, : 
Artificial Caoutchoue-—This substance is obtained by the action of 
chlorid of sulphur on oils. On adding to oils an excess of this chlorid, 
they become heated and take a consistence more or less viscous; after 
‘ome days they harden and become friable. With one part of the chlo- 
Tid to nine of the oil, there is a lively reaction, chlorhydric acid is dis- 
*ngaged, and it is all changed into an elastic substance like sponge wh 
Whitens in the water. The products are insoluble in water, alcohol, ether, 
- the subject to th “In order to protect the glass stopper 
1 48k containing chlorid of sulphur from incrustation, I put on it a 
[ not a little surprised on the next da the coating 
sed by the chlorid, and that in neral, this compound hardened fatty 
bodies by modifying them more , Being then engaged in other 
