106 Scientific Intelligence. 
Only the corrugations in the open part of the cut are visible; 
the extension of the vein to the right and left, in fig. 1, is ideal, 
the superincumbent mass covering it. I measured, however, the 
quartzite above, dipping to the right and left at a small angle, 
and I think no geologist would doubt that the crest of an anticli- 
nal axis here comes to the surface and has escaped the denuda- 
tion which has removed the top of the crest in most places. The 
corrugations, or folds, appear to be accounted for on the hypo- 
thesis of a lateral thrust producing the undulations. The per- 
spective view (fig. 2) of this interesting locality was taken from a 
tereoscopic photograph, showing the appearance of the barrel- = | 
quartz after the surface-rock (quartzite) had been removed, ant 
before the miners had broken up the quartz layer for removal. 
The value of the barrel-quartz has been not so much from its 
large average yield of gold as from the comparative cheapness 
with which it has been mined. ‘Thus it appears from the state- 
ments in the Chief Gold Commissioner’s Report, dated Jan., 1868, ’ 
that each miner on Laidlaw’s Farm averaged for the last three 
months of the previous year over nine tons per month, while in 
other districts the average monthly product per man was from 
two tothree tons, The average ween of gold was smal],—-about 
five pennyweights to the ton; the maximum being three ounces, 
not including remarkable discoveries, like that of the Chebucto ¢ 
Company, of a mass of this quartz, yielding, as already men- 
tioned in the Introduction, for a volume of not over two cubic 
feet, over $4000 in value, of gold. 
SCIENTIFIC INTELLIGENCE. 
I. PHYSICS AND CHEMISTRY. 
1. On the constitution of the Sun—Maanvs has communicated a brief + 
ard t ern 
Although the temperature of the flame was ck le 
quantity of heat radiated was much r than before, 
e Mang cry yin which was 55 millimetres 
