Sj« New SpicUt if Elajl'tc SUumtn, 



SPECIES theFIRST. 



A, No. I. — Elaftic bitumen of a yellowifli brown colour, part of which is ahnoft liquid 

 like petroleum, and adheres to the fingers ; the other part is of a darker colour, of a mam- 

 niiillary form, does not adhere to the fingers, and is foft and elaftic. This is on a grey 

 bituminous limeftone, with white calcareous fpar in the figure of hexaedral pyramids, form- 

 ing that which is called the dog-tooth fpar. 



A, No. 2. — Bitumen of a yellowifh brown, partly liquid, and partly elaftic, which, how- 

 ever, adheres to the fingers ; on pale grey limeftone, with cryftals of white fluor fpar, blende, 

 and galena. — On another part of the limeftone are fome globules of bitumen of a rcddjfli 

 brown, perfedly hard and brittle. 



A, No. 3. — Dark brown bitumen of a ftalaGitical form, hard, but in fome degree 

 elaftic. 



A, No. 4. — Bitumen of a reddifti brown, in the form of globules, fome of which arc 

 elaftic, and others hard ; on brownifli-grey limeftone, accompanied by cryftallized white 

 fluor, dogtooth calcareous fpar, and pyrites in fmall cryftals, fome of which are on the fur- 

 face of the globules of bitumen. 



A, No. 5. — The fame of a darker brown, of a ftala£titical form, hard and brittle; on 

 pale brown calcareous fpar, impregnated with bitumen. 



A, No. 6. — Bitumen of a dark reddifti brown, very hard ; on pale brown fparry ftink- 

 ftone, with grey limeftone, in which are fome coralloides. 



A, No. 7. — Bitumen of a dark yellowiih brown, elaftic, but very foft, fo that it adheres 

 to the fingers. 



A, No. 8.— The fame thinly fpreadover grey fparry ftink-ftone. 



A, No. 9. — Bitumen of a brownifli olive colour, which becomes reddifti brown by the 

 air, but when oppofed to the light it appears femi-tranfparent, and of a yellowifti brown in- 

 clining to or?.nge. It is foft, very elaftic, and (when recently cut) adheres to the fingers, 



A, No. 10. — ^The fame of a darker brown, and harder in a fmall degree. The fpecific 

 gravity of thisfpecimen is 0,9053; water being eftimated at 10,000 (q. !,ooo ?) at temp. 60°. 



A, No. 1 1 . — Bitumen of a dark brown, harder than the former. This exactly refcmbles 

 the cahout-chou in the degree of elafticity, and in the property which it pofleircs of removing; 

 the traces of black-lead, 



A, No. 1 2, — The fame, but rather harder. 



A, No. 13. — The fameof ablackifhbrown, which is flightly elaftic when the weather is 

 warm, but is brittle when cold. 



A, No. 14. — The fame of a blackifh brown, nearly black, which fcarcely poficiTes any 

 elafticity; it breaks, and rcfembles afphaltum in luftre, colour and fra£lure. 



A, No. IS.—- The fame of a reddifti brown, perfedly hard and brittle. The charaflers 

 of afphaltum are complete inthis fpecimen. The fpecific gravity is 10,233. (q. 1,233 '■) 



The other fpecles of elaftic bitumen, which I fhall diftinguifli by the letter B, has been 

 found during the laft three years in a rivulet which runs at the bafe of Mamtor, from weft 

 to caft, at a fmall diftance from Odin mine. — The varieties of it, in my poflbffion, are as 

 fc/U»w :— — 



6 SPECIES 



