[ 1.84 ] 



gin to fhake them both together 

 fooner or later, if you continue 

 fhaking them for a longer or morter 

 time in one experiment than in 

 another, if you calf up the account 

 by obferving the degree of the 

 rneafure, or of the brafs fcale, fooner 

 or later, &c, you will find in every 

 experiment very considerable vari- 

 ations. 



SEC- 



