[ 2 97 } 
The folution of the problem enquired after in the 
papers I have fent you has, I think, been hitherto a 
deflderatum in philofophy of fome confequence. To 
this we are now in a great meafure helped by the 
abilities and fkill of our late worthy friend /and 
thus are furmfhed with a neceffary guide in deter- 
mining the nature and proportions of unknown 
caufes from their effeds, and an effedual guard 
agamft one great danger to which philofophers are 
iubjed ; 1 mean, the danger of founding conclufions 
on an inefficient indudion, and of receiving juft 
conclufions with more affiirance than the number of 
experiments will warrant. I am, under a fenfe of 
the value of your friendffiip, heartily yours, 
Richard Price, 
Q. q 
Vol» LIV. 
Art. 
