On the Composition of a Pseudo-Steatite. 447 
The following are the physical characters of the mineral: — 
It occurs in irregularly striated masses of a dark-green colour, 
which here and there changes to a brownish tint; it has 
generally a dull surface, and when exposed to the air efflo- 
resces ; fracture uneven ; it is easily broken and reduced to 
powder, which has a green colour. Every part of the masses 
has the genuine soapy feeling of the steatite. Its degree of 
hardness is 2*2 ; as it is hardly scratched by gypsum, but is 
distinctly so by calc spar. Streak dark greenish grey, and sub- 
lustrous. It does not adhere to the tongue, has no taste, but 
has a slightly argillaceous odour, especially when a fresh sur- 
face is exposed. The specific gravity is 2*469. Before the 
blowpipe it is infusible, but changes in colour from green to 
brown; with borax a yellow head changing to green; with 
carbonate of soda a persistent dull green. 
The results of our analyses are now appended. 
Tliomson. Binney. 
Silica, 41-89 ... 42-78 
Protoxide of Iron, . . . 6-62 ... 6-31 
Alumina, .... 22-05 ... 22-53 
Manganese, .... traces ... traces 
Lime, .... 2-42 ... 2-54 
Magnesia, .... 6-16 ... 6-76 
Water, . . . . 20-22 ... 18 68 
99 36 ... 99-60 
Si02 RO R2<^3 HO 
Oxygen ratio, 4 12 3 
IX. Notice of a Foetal Narivhal (Monodon monoceros, Linn.') By 
Robert Brown, Esq. 
Mr Brown exhibited a small foetal specimen of a Nar- 
whal {Monodon monoceros, Linn.) ; and stated that another 
foetus was also found in the uterus of the same animal, 
which was captured in Davis' Strait, June 23d, 1861. 
In the " Linnean Transactions'' (vol. xiii. pp. 620, 621, 
" Extracts from Minute Book"), in a letter from Mr W. R. 
Whatton of Manchester, it is noted, that in the summer of 
1821, while a Hull whale ship was beset in the ice in the 
VOL. II. 3 m 
