4o ESSAYS ann OBSERVATIONS 
ons, is, in an obfcure and indiftin@ manner, 
really faying no more, than that a force is 
generated in the one body, equal to that 
whichis loft in the other. 
In accounting for the preflure of fluids 
undequaque, Mufchenbroke reafons thus; he 
fuppofes the water in a veffel to be compofed 
of perpendicular columns of fpherical par- 
ticles, one refting upon another from the fur-- 
face downwards, and all refting upon the 
bottom of the veffel. Thus the bottom of 
the veflel is preffed downwards with the 
weight of a column: and, becaufe action 
and reaction muft be equal, therefore, fays 
our author, the bottom of the veffel mutt 
prefs upwards with the fame force, 7. e. with 
a force equal to' the weight of the column; 
whence, fays he, the whole preflure up- 
wards, muft neceflarily be equal to the whole 
preflure downwards. 
So far our authot’s argument appears con- 
clufive, that, admitting the law of action and 
reaction, a preflure undequaque mutt be the 
confequence: and as the law: is not confined 
to fluids, but is fuppofed to be an univerfal 
law of matter; a preflure undeqnaque muft 
not only be the confequence in fluids, but in 
folids 
