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colours in a ftill more beautiful manner, Mr. Henly' 
will prefent to the Royal Society, for the infpeCtion 
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 effe&s of earth- 
quakes by the lateral force of expiofions •, 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 filk and 
amalgama. 
Wilhing we had more fuch fellow labourers as 
Mr. Henly, I am. 
Dear Sir,., 
Your obliged 
humble fervant,. 
oa.r; 77 0. J. Pricftley,. 
XXVII. Me- 
