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colours in a (till more beautiful manner, Mr. Henly 

 will prefent to the Royal Society, for the infpectiom 

 of the members. 



Befides thefe improvements, Mr. Henly has like- 

 wife, in a very ingenious manner, diverfified feveral 

 of the more entertaining experiments in electricity, 

 particularly in his imitation of the effects of earth- 

 quakes by the lateral force of explosions •, and he 

 has alfo hit upon feveral curious facts, that, unknown 

 to him, had been obferved before by others : the 

 following particular, however, I believe is new, ex- 

 citing a flick of fealing wax, and ufing a piece of 

 tin foil for the rubber, he found that it would elec- 

 trify pofitively, as well as glafs rubbed with iilk and 

 amalgama. 



Wifhing we had more fuch fellow labourers as 

 Mr. Henly, I am, 



Dear Sir, 



Your obliged 



humble fervant,. 



oa. 2^1770. J. Priefllejc 



XXVII. Afe- 



