40 
(a) Oligistic oxyd, in beautiful plates, and with iridescent 
hues. 
(6) Yellowish sulphuret, in cellular squares, wih quartzy 
crystals. : 
5. Black and yellow marble, from Upper Egypt. 
6. Cloudy agate, resembling petrified wood. 
7. Various specimens of variegated wacke, bituminous 
shale, &c. 
8. Stalactite, from Madison’s Cave, Vir.—Van Ness. 
9. French chalk, or craye de Briancon. 
10. Factitious substance, resembling pumice; from Al- 
- Jaire’s Tron-works, Egg Harbour. ; 
11. Steatite, from Orford, high up Connecticut River; 
of which stoves and fireplaces have been made.—Quincy. 
12. Kelp, from Falkland Islands, from the burning of 
sea-weeds.—McKay. | . 
~13. Several other things. 

ADDENDUM. 
: +t ae pedienainas 
- => Paragraph omitted from the Third Shelf. Strike 
out No. 24, and insert the following :— 
24, TirTeEn specimens, some compressed, others per- 
fectly shaped; a few fractured, the greater part entire; 
certain of them naked, the rest with their matrix adhering. 
From Kentucky. ‘They had been received by the donor 
before the year 1810; and had been particularly noticed, 
as exceedingly singular relics, in Mitchill and’ Miller’ s 
Medical Repository, vol. xi. p. 415. Is the pentremite 
- which is latterly considered as having given rise to the 
family blastoidea. Of the several species belonging to the 
genus pentremite, the Kentucky fossil, is the pentremites 
florealis. —Brown.—(Acad. Nat. Sciences, vol. iv. p. 295.) 
ON fling 









