PHYSICAL AND LITERARY, jr 



fmell, and fuf^ered no change from the 

 addition of fyrup of violets, or the acid 

 of nitre. The event was in every refpetft 

 the fame, when a quantity of the fame 

 marie was boiled in water for a confidera- 

 ble time. Many varieties of clay, flone, 

 and Hate marks were treated in the fame 

 manner, with the fame appearances. 



E X P E R. II. 



Two drachms of newly dug fhell* 

 marie, free from mofs, fragments of pu- 

 trid-wood, &c. and previoufly dried, were 

 digefted as in the firft experiment. The 

 marie neither loft any of its original 

 weight, nor commuricated to the water 

 any thing difcoverable by the trials men- 

 tioned above. The appearances were the 

 fame when this marie was boiled in wa- 

 ter *. 



From 



* Caution is neceflary here. Shell-tnarle not only con« 

 Jains many fej^nraie fragnr.ents of putrid wood, but is alfq 

 very commonly mixed with parts of the mofly llratum, 

 under which it is generally iound If roarle, containing 

 einher of thefe fjibftapces, is eirployed in the preceeding 



czperiment. 



