436 Scientific Intelligence. 
Now er to various authorities we have for the specific gravity 
of the diamond 
Ure, ; : ‘ ‘ ; : : 3°53 
Brewster, colorless, : : ; : : 3°52 
orange, . ° : ‘ : 355 f 
Jameson, twelve authorities, mean, : Z 302 eI 
Mean, . : . : ‘ ‘ j . eb 
And hence assuming our model to be exact, (and it is very nearly 
so,) we have by a simple perenne not quite 1108 grains for the ac- 
tual weight of the Nizam’s diam 
This is equal to 277 carats of gomeey of the rough diamond, and as 
the rough stones are usually taken to ne, but one half of their wel 
when cut and polished, it would allow 1384 carats, or a wei 
tween the Pitt (or Regent) diamond (1363 carats), and that of th 
Grand Duke of Tuscany (139 carats), for it in its prese si? co 
and if we take it that Sa of what it would be w 
was taken off with the splinter sold to the native, as esr oy Captain 
Fitzgerald, we shall then have 1553 carats for the possible weight of 
of pure water, which can, only be ascertained by cute! it, thor 
we know that the natives of India, and particularly of the Deccan, 
too good judges of diamonds to mistake a topaz for one, and it is state 
that 70,000 rupees have been paid for the fragment. . It therefore cer- 
tainly adds one cone fact more to the history of this most won- 
— of the gem 
An account er the Strata and Organic Remains exposed in the 
Gasitncs of the Railway from the Great Western + 66 near Corsham, 
through Trowbridge to Westbury in Wiltshire; by RecinaLp NEVILLE 
Manrett, Esq., Civil Engineer, (Proceedings of the Genlogiaal Society 
of London, Feb. 27, Sir C. Lyell, President, in the Chai iy ta —This line 
ing promiscuously intermingled. ome of the finest examples of 
Belemnites and Belemnoteuthis hitherto known, were found in these de- 
posi 
have been described by Dr. G. A. Mantell [the author’s 
