420 
THE GEOLOGIST. 
tho solution, and expose it either to the air or to the iieat of an oven until the 
water of crystallization has escaped ; then, this prepared chalk, when put into 
boiling water will ])robal)ly break up witliout j^reatcr force being' employed than 
a connuon )>ainter's sash-tool will exert iijiou it. The fine particles should 
then be washed away ; and the remainder will jirobably be found to consist of 
Foraminifeni, and should be mounted in Canada-balsam, to l)c seen projjcrly." 
Some of the A\'hite Chalk of Yorkshire, hovxver, requires to be sliced and 
polished before it can be examined microscopically. It is very intractable, as 
Mr. Norman', the well known microscopical mechanist, found, though he suc- 
ceeded in overcoming the difficulty and in preparing some very good slides. 
The I{cd Chalk from Elamborough, having oecn mauipulated by Mr. Deane, 
was examined by Messrs. W. K. Parker and T. E. Jones, and was found to 
contain the following Foraminifcra : — Gloljigcrina bulloides ; small, very com- 
mon. Tcxtularia pygmfpa ; small, common. Rotalia ammonoides ; small, 
rather common. IJeniaHna co?mnutiis ; small, rather common. Cristellaria 
roMata ; of middling size, rare. 
These gentlemen also inform me that the thin slices of the hard White 
Chalk from Flainborough, when magnified fifty diameters, arc seen 'to be ex- 
ceedingly full of minute chambers, or ceUs, of Globigerina and Dentalina ; the 
former predominating. There arc also a few Textularim observable. The 
chambers arc generally separate ; but here and there characteristic groups of 
them remain attached to each other. The general appearance is that of very 
finely washed common chalk. 
These Foraminifcra indicate a deep-sea-condition to have been that of the 
Chalk-deposit, and such as that of the mid-Atlantic or the Indian Ocean, where 
Globigerina still abounds. 
Treated with acid, one of tlic specimens of the White Chalk exhibited evident 
remains of organic matter, such as what may well be considered as disintegrated 
diy sarcode of Foraminifera . It is chiefly globular ; but some of it is 
filamentous. 
Chemically examined, the Eed Chalk gives 70 per cent, of carbonate of lime; 
the residue being quartz-grains and silicate of iron. Digested in very strong 
acid, about 4 per cent, of peroxide of iron is obtained. The White Chalk 
leaves scarcely any residue when treated with muriatic acid.— Majok-Gen. 
Emmett, R.E., F.G.S. 
Clav-Slate and Gkanite. — A correspondent in Halifax, Nova Scotia, 
mentions the following interesting facts : — " This province has many points of 
geological interest, w'hich have \iee\\ all ably dealt with by Dr. Dawson. In 
the small way, it is curious to observe the highly metamorphic condition of 
' clay-slate' when more or less acted on by granite. I have a beautiful speci- 
men of granite containing two stiU weU-lammated fragments of slate. Another, 
in which the fragment seems turned into a granitoid stone ; and every stage of 
the process is to be seen in all the chiselled blocks of ' ashlar' (granite) in the 
various buildings hereabouts, a disfigurement to the white granite, it is true, 
but very interesting to geological scrutiny. Also, this clay-slate has more 
tiian a tendency, at times, to turn into mica-slate. Once I caught it in the 
fact of looking very like rudimentary hornblende-slate. 
There is a large boulder of the metamorphic slate on the hiU above here, 
with equal tendencies to weather in coats, as we so frequently see in granitic 
cheesewrings, basalt, trachytes, and I believe, all igneous rocks. 
Another point is its extensive tendency to become white externally, as if it 
were felspathic." 
Fossil Bones at Fkogmobe. — A fragment of a leg-bone of an Elephant, 
another of Bos (?), a broken horn-core of Bos, and an antler of Germs inter- 
medins (y) have lately been met with near the New Garden, at Frogmore, in a 
