and Union of Supposed Distinct Species. 301 
peach-blossom, or purple stains, penetrating the seams of the 
limestone: precisely the character of this mineral in the speci- 
mens I have of it, from Finbo, in Sweden. With this it also 
agrees in hardness and color. When heated in a glass tube, 
it slightly decrepitates, shows no phosphorescence, gives out 
moisture, and becomes milk-white ; at the same time, there is 
a perceptible burnt smell. When its powder, moistened with 
sulphuric acid, is placed in a platinum crucible, hydro-fluoric 
acid is given out by the application of heat, and the usual 
reaction on glass is produced. "The pulverized mineral, heated 
with fused salt of phosphorus in an open glass tube, also 
shows the same reaction, the glass losing its polish where the 
moisture is deposited. In these experiments I was careful to 
separate the mineral entirely from the Brucite ; but I have not 
been able to obtain fragments sufficiently free from carbonate 
of lime, to enable me to give its blowpipe characters in detail, 
or subject it to any other trials. I hope to be able to obtain 
better specimens at an early day, and then to complete its 
examination. The mineral is very characteristic, and, in the 
hand specimen, cannot be distinguished from the Finbo va- 
riety, 
Ottrelite identical with Phyllite. The name of Phyllite, 
from gviior, a leaf, was given by Dr. Thomson to a mineral, 
Which was discovered and sent to him for analysis by Prof. 
Nuttall. It comes from Sterling, Massachusetts, and is dis- 
"eminated, in small, thin plates, through what appears to be 
an argillo-micaceous slate. Some of these plates are angular 
and others rounded, not appearing to have any regular crystal- 
ins form ; yet, in a few instances, they present the distinct 
form of rhomboidal tables. Color, brownish-black, or grayish 
lack ; lustre, shining and semi-metallic; opake; fracture, 
“neven, The knife makes a faint impression upon them. In 
‘trong transmitted light, the thinnest disks present a greenish 
Color. Before the blowpipe, on charcoal, it becomes magnetic, 
but does not fuse even on the edges; with double its bulk of 
