190 Canadian Record of Science. 
fresh, although in places it is slightly decomposed to chlor- 
ite. The magnetite is probably titaniferous, as occasion- 
ally it is altered to leucoxene. Another hand specimen of 
the same rock was found to contain, in addition to the 
minerals mentioned above, a little quartz and a little pla- 
gioclase, and the orthoclase contained the peculiar inter- 
growths characteristic of perthite. This specimen had a 
very obscure foliation, and the quartz and orthoclase 
showed evidence of having been submitted to pressure. It 
also contained a few forms of some mineral which had been 
entirely decomposed, but which may have been pyroxene. 
-The rock from the “Blessington Mine” is composed 
essentially of orthoclase, biotite, pyroxene and magnetite, 
with a little plagioclase, hornblende, pyrite, calcite and 
apatite. The orthoclase contains a multitude of minute, 
black, rod-like inclusions and fine dust. The pyroxene 
occurs in large amount, and is more plentiful than the 
biotite. It is pale green in colour, with scarcely notice- 
able pleochroism and large angle of extinction. It is gene- 
rally without good crystalline form, but occasionally occurs 
in rude crystals. It is also occasionally twinned. The 
hornblende occurs in very small amount—intergrown with 
the pyroxene and biotite. The calcite is present in small 
amount, and results from the decomposition of the pyrox- 
ene and feldspar. The magnetite may be titaniferous. 
The apatite is uniaxial and negative, and occurs in irregu- 
lar shaped grains, with high index of retraction and faint 
bluish colour, generally associated with the pyroxene. 
The rock from the “Star Hill Mine” is therefore a mica 
syenite, and that from the “ Blessington Mine” an augite 
mica syenite. It will be a matter of interest to ascertain 
whether these rocks occupy a similar relation to the apatite 
at the other mines. A monograph of the apatite district 
of the Province of Quebec, which is now being prepared 
by Mr. Ingall of the Geological Survey, willl decide this 
and many other important points. 
Among aseries of specimens from the vicinity of the town 
of Arnprior, on the River Ottawa, which were some time 
