956 REPORTS ON THE STATE OF SCIENCE. 
first Report, such as may be caused by the action of the cold walls of an 
explosion vessel in which a truly homogeneous mixture is exploded.* 
Some light is thrown on this question by some experiments made by 
Dugald Clerk during the year under review, who has exploded mixtures 
= 
EXPLOSION APPARATUS 
WITH 
AUTOMATIC_EXHAUST. 
MTG. 
£6 ON 
a | 
Ia) ji 
<< 
FIG.S. 
, a 
of coal-gas and air in an apparatus (shown in Fig. 3) consisting of a 
cylinder containing a piston A, which piston could overrun a port B at 
1 Prof. Bone writes :,‘I am not in the least surprised that Dr. Wateon has 
obtained evidence of some disappearance of carbon (as a soluble product) in his 
