Teh. 
240 W. B. Rogers on Sonorous Vibrations by Flames, etc. 
as I am aware assume the form of intrusive rocks. The results 
ir W. E. Logan’s examinations of the Green Mts. show that 
the Silurian ophiolites of Canada are the stratigraphical equiva- 
ents of a series “s silicious dolomites and magnesites, whose 
alteration has doubtless given rise to the serpentines, tales, dial- — 
lages and chlorites. I have already shown that the action of a 
solution of alkaline carbonate at a slightly elevated tempera 
upon mixtures of e arthy carbonates and quartz, suffices to co 
vert the bases of these into hydrous silicates. The same casel 
has at the mony me given rise to the feldspar and mica of ' the, 
noua ¢ 
Arr. XXX.—On the Origin of the Sonorous Vibrations prota 
_ under certain conditions by Fines es from Wicks or Wu 
by Prof. Wittiam B. Rog 
Iw the latter part of the article on Sonorous Flames, an 
lished i in the July number of this Journal, a wall be rete 
the sonorous vibrations observed in certain cases wit 
arising from wicks or wire-gauze. I have indeed endeavored io 
show that thes latter phenomena are directly dependens 2 on the 
source anterior to th osive action. A few remarks on this 
part of the subject or ree form a useful supplement to my 
nat Mae a ap cation. 
, The mass of gaseous matter which rises from a wick or from 
meshes of wire-gauze is to be regarded as made up of npu 
le streams variously intermingling and conflicting with 
original and regular vibratory movement due to the d 
> of the Es, aes that which Maesa n and others have s! 
