77 o 
Col. roy’s Experiments , &e 
and a fcrupulous attention to their various adjuftments, 
become indifpenfably neceffary, In fhort, the facility of 
one method, compared with the other, is fo exceedingly 
obvious as to need nothing elfe to recommend it as a 
fubject very curious and ufe'ful, and therefore well wor- 
thy of the refearches of philofophers, till, by their united 
labours^ it hath been brought to perfection. 
N° i: 
