14 Notice of Prof. Clark’s Thesis on Metallic Meteorites. 
pyrites in the form of small grains and lines, as well as in larger, 
reniform and cylindrical masses. Widmannstattian figures very 
distinct, which are mostly isosceles triangles, the bands crossing 
at angles of about 77° and 26°. Gr.=7-73, Rumler. Analyses: 
Clark. Wehrle. 
Iron, - 90:°153 - 90883 
Nickel, - ~ 1 6-563 - 8-450 
Cobalt, - 0-502 - 0-665 
Manganese, - 0145 
Copper, - 0-080 99-998 
in, - 0-682 
Sulphur, - 0-482 
Phosphorus, = ear 
Insoluble phosphurets, 1:226 
99-223 
grms. were taken, and for the other 2-074 grms. The method 
employed was, in general, like that adopted in the analysis of the 
Hommoney Creek meteorite. ‘The sulphur was determined as 
sulphuret of silver, and sulphate of baryta. The tin and copper 
were precipitated by sulphuretted hydrogen, roasted, reduced 
with carbonate of soda and borax, and tested, both in the wet 
and in the dry way. The iron was precipitated as succinate. 
In washing the precipitate, a small quantity was dissolved, al- 
though the solution had been rendered exceedingly basic before 
the addition of the neutral succinate of ammonia, and then 
heated to boiling before filtration. This was probably owing to 
the presence of phosphoric acid, which appears almost invariably 
to be formed by the solntion of meteoric metal in hydrochlori¢ 
acid. The nickel, cobalt and manganese were thrown down by 
hydrosulphuret of ammonia, and the solution allowed to stand 
till it became colorless and clear, when it was filtered off, and 
evaporated almost to dryness. A few drops of hydrosulphuret 
of ammonia now precipitated a small quantity of nickel. The 
sulphurets were then dissolved in aqua regia, and thrown down 
by potassa. After weighing, the oxyds were redissolved in hy- 
drochlorie acid, reprecipitated by potassa, brought upoma filter 
and washed. The moist oxyds of nickel and cobalt were then 
dissolved upon the filter by a mixture of solutions of potassa and 
prussic acid, the manganese remaining undissolved. The solution 
was boiled to expel the excess of prussic acid, and to change the | 
cyanid of cobalt and potassium, to sesquieyanid. The nickel 
was then precipitated by boiling with freshly prepared oxyd of 
mercury. The cobalt was determined qualitatively by neutral- 
izing the alkaline. filtrate with nitric acid, _ throwing down 
the cobalt by means of nitrate of suboxyd of. mercury ; and 
