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I 



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64 



T H 



N A 



R A 



H 



TOR 



well as to purify the waters commonly ufed in their diluted drinks. It is a native of 



Madera and Barbadoes. 



T. 



VII. 



A 



De marga &* margaceis. 

 Of Marls and marly Subftances. 



f 1 . Friabilis alba . 







. i i 



2 



M ARGA 



3 



White friable Marl. 

 Subpinguis ten ax. 



The aboo earth, or clammy Marl. 



Conch ace a. 



Shell Marl. 



*- m 



4. Terrea vane mixta. 



\ 





Marly foil, or mixed Marl. 



U 



e are the only fpecies of Marl I could obferve in that ifland , but the third and 



jrth are not common ; and the firft is generally bar 



for 



affords neither 



foment 



fy paflag 



the tender roots of vegetables. The (hell 



fcarce, and hardly ever met with, but in the mountains, or 



manure for all ftiff, and clayey foil 



fea-fide 



it is 



a 



The fecond fp 

 found in marly beds 

 of the layer wherein it is found 

 cohefive in ii 



peculiar fort of earth, th 



and is chiefly 



of different colours, but thefe generally anfwer to th 



apparently fmooth, and greafy, and fomewhat 



in its nature j but diffolves eafily in the mouth : The Negroes, who make 

 frequent ufe of this fubftance, fay, that it is fweetifh , and many get a habit of eating 



fuch excefs, that it often proves fatal to them 

 have known, when ufed for any length of 



It 



the moft certain poifon I 



id often enters fo abundantly 

 the courfe of the circulation, as to obffrudt all the minute capillaries of the body ; 

 nay, has been often found concreted in the glands, and fmaller veffels of the lungs, fo 

 far as to become fenlibly perceptible to the touch : It breaks th 



blood intirely ; and for many months before they d 



mach 



and all the 



parts 



and 



gums, 

 much, that the whole mafs of their juices, feems to 



be 



; texture of the 

 general languor affe&s the 

 gue, are 



, are quite pale, info- 

 better than a waterifh 



lymph 



It is probable they are firft induced to the ufe of this fubftance (which is 



generally well known among them) to allay fome fharp cravings of the ftomach 



ther from 



worms 



habit of bedy 



The following are the moft remarkable compound productions of this kind 

 uld have met with in Jamaica. - 



1 . Parajiticunty cry ft alii s minimis cuniformibus fubaqueis. 

 The fmall parafitical fpate, or fpar, with wedged 



cryftals. 



This fpecies of fpar is frequent in the filTures, and interfaces of the lime-ftones, 



SPATUM 



in all parts of "Jamaica. 



1 



SPATUM 





Subaqueum majfulis triquetris prifmetico-truncatis quad 



talcofis y fragments s rho mbeis. 



The fubaqueous fpar found in three angular truncat- 

 ed and prifmatical mafles. 



Rupejlre fubaqueum y fiibcryftallizatum G? fubftria- 



tum % *^ 



The Rock-fpar. 













>- 



This 





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