312 THE GEOLOGIST. 
specimens referred to how is it possible that he can know whether they are 
WTOUg or not. 
The above specimens, together with many other species, I received from a 
gentleman residing in the immediate locality, who is a very enthusiastic col- 
lector of the Lower Silurian fossils, and who I believe was the discoverer of 
most of the species found in that part, many of which I am aware have been 
described by Mr. Salter. 
Mr. Salter's styling the communications from me in your "Notes and Queries" 
advertisements, is another mistake ; but others know as well as myself how 
positively you close the pages of your journal against any transactions of a 
mercantile character. — I am. Sir, yours, &c., James R. Gregory. 
New Minerals. — The following seven species or varieties of minerals were 
described in the ninth supplement to Professor Dana's jSIineralogy, by Prof. 
G. J. Bush, and published in the May number of Sillimans' American Journal 
of Science. 
Dianite (Von KobeU). This new mineral described by Yon Kobell is a 
variety of tantalite, found at Tamela in Pinland: the specific gravity of dianite 
is 5-5, and that of tantalite 7*38 to To. The colour and streak of dianite is 
blackish grey, and of tantalite dark brownish red. Yon Kobell distinguishes 
a new metallic acid, which he proposes to call dianic ac'd, in this new mineral; 
and he also finds it in exenite, aeschinite, and samarskite. 
Hjelmite (Nordenskidld). This is a new tantalite from Kararfshof in 
Sweden, and is described by Nordenskiold — the colour jet-black; lustre metallic; 
fracture granular; specific gravity 5*82; hardness 5"0 ; streak blackish grey. 
Hoeniesite (Haid.). A new hydrated arseniate of magnesia from the Banat. 
It was first recognised by Dr. Kenngott on a specimen in the Imperial cabinet 
of Yienna. It occurs in talc-like, stellated, columnar, and snow-white pearly 
masses, transparent, and optically bi-axial ; the lustre on cleavage pearly ; 
flexible. Specific gravity 2-4:74 ; hardness 0-5 to I'O. 
Melanhydrite. A new mineral found in a decomposed wacke, from Schmel- 
zerthal, near Hounef, on the Rhine, and first described by Krantz. It is 
found amorphous, in ii-regular nodules, having a concboidal fracture. Opaque ; 
colour velvet-black to brownish black ; streak blackish brown : it does not 
fall to pieces in water, and in small fragments adheres to the tongue ; in com- 
position near pelagonite. 
Puiitoid (A. Knop). This is a new name to a rock-specimen from Chemnitz, 
in Saxony. Colour leek,- oil,- and greenish-grey, passing into white andred : 
specific gravity, 2*788 ; hardness 2'5 : very closely allied to pinite. 
Pisanite (Kenngott). Dr. Kenngott describes this as a cupreous variety of 
copperas. 
Vranophane (TYebsky). This new mineral is from a copper-mine at Kupfer- 
berg, in Silesia ; compact and amorphous. Colour honey- yellow to siskin- 
green, in microscopic crystals. Specific gravity 2*78 ; hardness less than 3"0; 
lustre vitreous to pearly. — J.R.G. 
New Caverns in Yorkshire, — Dear Sir, — It may be interesting to many 
of your readers who are likely to visit Yorkshire during the ensuing vacation, 
to know that two new caves have recently been discovered in the mountain- 
limestone district of that county — one at Greenhow HiU, near Pately Bridge, 
and the other in Littondale, near Kilnsea Crag. The former contains some of 
the finest specimens of stalactites ever met with in this county, which have 
fortunately been to a great extent preserved from the ruthless destruction of 
curiosity-seekers. The cavern in Littondale has little to boast of in stalactites, 
but in foi-m and extent it far exceeds that of Greenhow HLQ. It has already 
been traced seven hundred feet into the hill, through the greater part of which 
distance it averages upwards of twelve feet in height, with a splendid tunnel- 
