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T H 



NAT 



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T O 



T. 



VIII. 



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i 



Of mixed) and irregular Productions : 



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PUMEX 



c i . Plumbeus fulphurariarum & thermarum. 

 c The livid pummy of fulphur mines. 





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f 







This fubflance is the meer produ&ion of fubterraneous fires : it is always found 

 in great abundance about the fulphur mines of Mountferrat, and doubtlefs may be alfo 

 obferved in Jamaica, could we reach the firft fource of the hot-well waters of that 

 place : the heat, at leaft, of thofe give me room to think, that fuch a thing exifls 

 there ; and, probably, may be always found where-ever this is conftant, and Jfrom 

 the confumption of fulphureous fubftances. 



PUMEX. 



Ferreus ater gypfo adnatus. 

 The Wack ferruginous Pummy* 



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This fubftance is very rare j I have met with a little of it far back, among the 



mountains in Jamaica, 



TOPHUS 



Aquarum incruftantium. 



The Tophus of incruftating waters. 



Labethum, 



The cruft depofited by boiling waters. 



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Thefe fubftances are only concretions of the heterogeneous % particles, with 



which many of the waters of this Ifland are charged : the firft fort is £o common in 

 moft of the fmall currents about St. Anne\ that every thing lying in their courfe, 

 nay the very chanel is frequently incruftated j and hence the fource and formation of 

 that beautiful, and famous cafcade, between Roaring-river, and Mendzefs-Bog, in 



this pariih. 



ARGILLARIA 



Subfufca filidiufcuhy variis admixta. 

 The dark and varioufly mixed Argillaria. 



m 



This is a mixture of clay and gravel, that hardens into a very folid form by the 

 continued heat of the fun, and a fmall admixture of fait- water ; it is the foundation 

 of that neck of land, that ftretches into the fea, and inclofes the harbour of King- 

 Jlon j as well as of fome other parts of the fea-fhore round this Ifland. It receives 

 but little damage from the furges, or more agitated waves -, but acquires a degree 

 of hardnefs as often as the incumbent fands are warned off, by hurricanes, or other 

 extraordinary commotions of the ocean. 



SABULUM 



j. Varium 



Gravel. 



many 



of the fore 



This is only a compofltion of the fmaller fragments of all, or 

 mentioned fubftances j which generally takes its fpecific denomination from the 



moft predominant kind : the mores 



mate a ; are full of various forts of this fubftance 



courfes, and many other parts of J t 



ARENA 



I. Varia. 



Sand. 



» 



Sand differs but little from the foregoing ; and, like that, is only a compofltion 

 of the more minute particles of all, or many of the other fubftances * which, in 

 the fame manner, takes its 



fpecific denom 



from the moft predominant fort 



I muft however remark, that we have clafled the purer fpecies of thofe that ufed 

 to go commonly under this appellation, with the other productions of the fame 



nature, and ranged the cryftalline fands among the quartz's ; the roundifh among 



the pebbles ; and black with the 





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