Chemistry and Physics. 403 
were less favorable for renewed growth—or other minerals, if 
such chanced to be in contact with the division line between 
the clastic fragment and its border of new material. 
_ The change which has taken place in one grain of orthoclase 
1s of some interest. The grain has been broken into two parts, 
which have spread somewhat, and is now cemented with a new 
' Material which extinguishes with the original fragments, and 
also with the exterior second growth, with which it is continu- 
ous In one place (fig, 4). . 
In some cases the new material deposited on a grain, instead 
of continuing as a single individual antil it meets a similar 
growth from another grain has crystallized independently in 
small interlocking grains (fig. 1). This independent feldspar 
i we are correct in so considering it) is more plentiful about 
the basic fragments than about the feldspar grains or those of 
the granitic porphyry. , 
neovered thin sections were prepared and the supposed 
feldspar enlargements tested—so far as practicable—as to hard- 
nes 
well with the idea that the borders are feldspars, and show that 
they cannot be a carbonate. : 
Most of the sections of the Hagle Harbor sandstones also 
show quartz enlargements, but in one none were seen. 
‘ This same secondary material has been found in other sand- 
Stones in the Keweenawan series, and in two cases the sand- 
stone directly underlies “greenstone.” Descriptions of these, 
however, will not be given, as they furnish no additional points 
of interest. 
SCIENTIFIC INTELLIGENCE. 
I, CHEMISTRY AND PHYSICS. 
oxide gas, and d : : , y 
crystallization. Though called anhydrous bisulphite by Muspratt 
and Marignac, it was found to have the formula 8,0,K,. It is 
characterized by the heat of its formation, by its se obs its 
e 
ormal bisulphite, and by its pyrogenic reactions. ay 
better > 
