( 347 ) , 
always, as they ought to be, proportional to their Cnufes. 
After the fame Manner the ingenious Mr. Grave fande 
once argued ; for thus he reafons in Paragraph 35*5' of 
^hyfices Elem, Mathematical Firfl: Edition. 
‘‘ Kon tamen eandem cum frofunditate froportio- 
“ nem feqmtur V&locitas, licet prejjio^ ex qua Veloci- 
“ tas oritur^ in eadem ratione cum profunditate 
crefcat. ^antitas motus qua in liquido produci- 
“ tuVy eft effect us tot us prejjionis^ ^ hac quant it as 
“ ad inftar prejjionis augetur. Ratio autem quanti- 
“ tat is motds eft compojita ex ratione Velocitatis^ dt* 
“ quantitatis materia mota^ hie materia mot a eft a- 
“ quay qua ex foramine exity cujus quantitasy ma- 
“ nente temporey cum celeritate crefeit ; dupla erit^ 
“ Ji hac dupla fuerity in quo cafu motus quantitas eft 
‘‘ quadrupluy id eft, augetur ut quadratum celerita- 
tisy quod pofttd celeritate quacunque femper obtu 
“ net ; crefeit ergo hoc quadratum utpreJJiOy id efty ut 
“ altitude liquidi fupra foramen ex quo profluit aqua. 
IV. A Copy of a Letter from Dr. David Kinneir, 
Coll.Med.Edingb.Soc. to Dr. Campbell, Coll. 
Med. Lond. Soc. Honorar. touching the Efficacy 
of Camphire in Maniacal Diforders, 
s I 
I N Converfation, t’other Day, on the Subjed of our 
Profeffion, I told you how fuccefsfully I had us’d 
Camphire in Maniac Diforders, which hitherto never 
2 has 
