C 547 ) 
obferves, firft that all motion in its proper tendency is di- 
rect, and that the Glandules are fo feated, as to favour 
the motion of any Particles that ftrike againft them in a 
right Line, more than the Veins 5 and having Pores a- 
dapted to the Figure of the Particles which they fepa- 
rate, the Particles do endeavour in their motion to pro- 
ceed into thofe Glandules, and being entertained by 
them, are feparated, and diftinguifht from the reft of 
the Mafs of Blood , and fo afiume the form of that 
Liquor we find feparated by every Gland; And to pre 
vent the Regurgitation of the feparated Matter out of 
the Glandules into the Mafs of Blood again , (becaufe 
the Du£b, which convey it to the Receptacle?, do not 
run fo as to favour the dircft motion of the Particles,) 
he fuppofes fome contrivance like Valves in the Pores 
by which the Particles enter into the Glandules. 
How the Situation of the nutrirous Glandules agrees 
with his AfTertion, that the Glandules are fo feated as to 
favour the motion of a Particle in a right Line, more 
than the Veins, is fhown by obferving the gradual con- 
tra&ion of the arterial Channel. 
He then goes on with the affair of Accretion, and the 
accountis in fhort this, chat the Nutritious Particles,being 
feparated by the Glandules plac'd in the fides of the Ar- 
teries, are carried into thofe fmall nervofe Pipes, or Inter, 
fticesof the Fibres where the Spirits move, fo that they 
fall in the way of the Spirits motion. The Spirits he 
fuppofes to have a twofold motion, onedirefl", the other 
rotatory turning upon their Axis. Whilft the Animal 
is capable of Accretion, and the Particles of which the 
folid parts confifl: are not entirely united at their extre- 
mities, but are capable of receding one from another, 
b:Mh laterally and at their extremities , the Spirits act 
upon the nutritious Particles, which are of a vifcous na- 
ture, by their rotatory motion, by which they carry 
them to the fides of the Fibres and bony Strings, driving 
fome 
