VOL. XIV.] PHILOSOPHICAL TRANSACTIONS. 85 



Coarse. — Grizly, Acome near York drifted sand; Hutton Moor washed; 

 Thorpe fells; Ouze at York; Nid at Mountain; dug up at RawclifF, near 

 Snath; Wharf at Ickly and Denton; Air at Carleton in Craven; Eure at 

 Bolton. — Brown; Gauton; Santon in Lincolnshire; Bomeby common; 

 Skipwith common. 



Soft or smooth withjlat particles. — From Limestone; At in Yorkshire; 



A vein at Oswell beacon in Lincolnshire. 

 With mica of glittering particles, of JVestmoreland; Silver-like', Sea sand about 

 the Scilly islands; in Cleveland and about Scarborough ; Ouze dust, or sedi- 

 ment at RawclifF. Gold-like; A vein of mica in Heslington gravel pit; mica 

 argentea in red sand rock near Rippon plentifully; mica aura of Cleveland. 

 Also I here give a scheme of clays, as well because it seems to be another 

 coat of the terrestrial globe in the more depressed and hollow parts thereof, as 

 because the mixture of sand and clay is not unusually called earth. Yet this 

 term being too large, it will be convenient to limit it to such a mixture as we 

 usually find on the surface of the ground, which has always in it, besides such 

 sands and clays as either the soil naturally produces, or have by floods or winds 

 or other accidents been brought thither, a great part of the rotten parts of 

 plants and animals. And in this sense turf is earth, which is mostly where the 

 erica or heath grows, because it is made up of the deciduous leaves of that 

 plant, which being by the current of showers brought together, make up the 

 moors, mosses, and fens, and in the mountains in hollow basins or depressures 

 without vent, mosses of incredible depth, 1 or 2 fathoms ordinarily in the same 

 kind of black earth, called peat or turf. 



A Table of Clays. 

 Pure, that is, such as is soft like butter to the teeth, and has little or no gritti- 

 ness in it. — Greasy, to be reckoned among the medicinal earths, or terree 

 sigillatas. 1. Fullers earth; yellowish at Brickhill in Northamptonshire; 



at under the Yorkshire wolds; brown about Halifax; white in 



Derbyshire lead mines. 2. Boli in Cleveland; at Linton upon Wharfe. 

 3. Pale yellow in the marl pit at Ripley. 4. Cow-shot clay, or the soap 

 scale lying in coal mines. 3. A dark blue clay or marl at Tolthrop 

 Harsh and dusty, when dry. — 6. Creta properly so called, or the milk-white 

 clay of the Isle of Wight. 7. The potters pale yellow clay of Wakefield 

 Moor. 8. The blue clay of Bullingbrook pottery in Lincolnshire. 9. A 

 blue clay in Bugthorp Beck, in which the astroites are found. 10. Yellow 

 clay in the seams of the red sand rock at Bilbro. 1 1 . Fine red clay in red 

 sand rock, at Bilbro, at Rippon. 12. A soft chalky blue clay. 13. A soft 

 chalky red clay, at Butlercrain. 



