INYOITE FROM NEW BRUNSWICK. 
15 
The axial plane is parallel to b(010) Figure 8. The birefringence is 
strong and negative. The dispersion is weak apparently p< V- The 
acute bisectrix (Bx a ) lies in the obtuse angle between the a and c axes and is 
inclined 12° 56' from the normal on c(001) and 37° 13' from the c — axis; 
2V a = 80° 33'. One of the optic axes emerges through c(001) at an inclina- 
tion of 27° 21' from the normal; the other emerges through a(100) at an 
inclination of 12° 31' from the normal. 0 = 1* 501. 
These measurements were made in the mineralogical laboratory of 
McGill University, Montreal, and the writer wishes here to record his 
thanks to Professor R. P. D. Graham in charge of the laboratory for the 
use of his instruments and his kindly co-operation in this connexion. 
CHEMICAL PROPERTIES. 
Pyrognostics. A splinter of the mineral held well above the flame of a 
candle or alcohol lamp becomes white and opaque, lowered into the tip of 
the flame it melts readily to an opaque white globule, hence fusibility 1 or 
less. A fragment heated before the blowpipe first crumbles and becomes 
opaque white, then fuses with intumescence due to the volatilization of 
B 2 0 3 to a glass which is clear and colourless while hot, white and opaque 
when cold, the blowpipe flame being coloured a strong green by the escaping 
B2O3. 
Solubility. The mineral is readily soluble in dilute acids and fairly 
soluble in water. When clear, transparent fragments are placed in water 
