[ 4 ° 3 
" leflened 3 that is, thefe Veflels thereby become 
ie ftraiter, and the Circulation in them therefore 
4C more difficult ; and in this State alfo the tranfverfe 
<c Blood-veflels of each Veficle will be forced into 
Terpentine Flexures, which mu ft render the Paffage 
ec of the Blood thro’ them ftili more difficult. 
Ci If the Mind impels but a little more of the 
<c nervous Fluid than ufual thro’ the (lender Tubes of 
te the Nerves into thefe extended Veficles, they will 
te be uniformly dilated. 
“ By this Diftcnfion of the Veficles, their Axes 
being fhorten’d, and their Diameters lengthened, 
the longitudinal capillary VclTels in their Surface 
<e muft be fhorten’d, and thereby their Diameters en- 
“ larged, and the Terpentine Flexures of the tranf- 
“ verTe Veflels will be extended; which, in both Kinds, 
<c will lefien the Refiftance they gave to the Tranfit 
<c of the Blood ; which, by the s DiaJiole and Syfiole 
of the Arteries, is continually urged on to its Paff- 
££ age thro’ them ; and, being thus facilitated, every 
<£ Globule of Blood in its Progrefs, by endeavouring 
<e to fly off by the Tangents of thefe Veflels and Ve- 
“ Tides, tends to expand them more, and thereby 
opens the Way for the further and eafier Influx of 
il the nervous Fluid, to which the Blood veflels con- 
tl tribute, as To many elaftic Levers acted upon by 
<£ the Blood in its Progrefs. Thus, by the Afliftance 
£{ of thefe three Powers, the nervous Fluid, Blood, 
te and Blood-veffels, the Progrefs from Extenfion to 
<£ Diaftoie of the Veficles is made, by which the 
<c Mufcle becomes tumid and enlarg’d in Bulk, 
<£ Bur, if the Mind defifls fending this Recruit, or 
iC fufpends it, then thefe circular arched elaftic Vcf- 
“ fels. 
