4 flDf tlje ^ecliamcat Origin? 

 EXPER. I, 



\yft fir ft Experiment is afforded 

 XVI me by the DilTolution of Sal 

 Armoniac, which I have fomewhat 

 Wonder'd, that. Chymifts having of- 

 ten occafion to purifie that Salt by 

 the help of Water? (hould not have, 

 long fince, and publickly, taken no- 

 tice of. For if you put into three 

 or four times its weight of Water a 

 pound or but half a pound (or even 

 lefs) of powder'd Sal Armoniack, 

 and ftirit about to haften the diffo- 

 Iqtionj there will be produc'd in the 

 mixture a very intenfe degree of 

 Coldnefs, fuch as will not be onely 

 very fenfible to his hand that holds 

 the Glafs whilft the Diilolution is 

 making , but will very manifeftly 

 difcover it felf by its Operation up- 

 on a Thermofeope. Nay , I have 

 more than once by wetting the out- 

 fide of the Glals, where the diflb- 

 lutioja was makings and nimbly ftir- 



ring 



