[ *7 ] 
y\ 
LXI. 
A Mu file in its Motion very evidently grows lefi 
in Bulk » 
This Propofition is clearly demonftrated by that 
famous Experiment communicated to the Royal So- 
ciety, by Dr. Goddard •f' in the Year 1669, where 
putting a Man s Arm into a glafs Cylinder full of 
Water, the Water always funk when the Mufcles 
of the Arm were contracted, and rife again to the 
firfl: Standard when they were relaxed. This we 
think may be look’d upon as an Experimentum Cru- 
ris 5 whereas, if every Fibre was a Chain of Blad- 
ders, whofe Contraction in Length arofe from their 
Inflation in Breadth, all the World knows there 
would be a fenfible Swell of the whole Arm upon 
mufcular Action. 
LXIL 
& " • 
There are {till other Difficulties attending the Ve- 
ficuhr Hypothejis. If the animal Spirits are fup* 
pofed to inflate the Cavities of the mufcular Fibres 
merely by a propulfive Force, like unto the Steam 
of boiling Water working in the Engine to raife 
Water by Fire, it ought to be proved from whence 
fo ftrong an Impulfe fhould arife; and alfo how the 
Nerves, which are the Conduits thro' which this 
flatulent 
t Vide Regifter of the Royal Society, Vol. IV. p. 05. 
D 2 
