PHYSICAL awn LITERARY. 397 
of the epidydimis, terminating at its other end 
in the vas deferens. 
Tuts feems to have been detertdlihecs or 
not well underftood, by moft of the modern 
anatomifts, who have differed widely, or 
talked with uncertainty, about thefe pipes; 
‘till of late, that the ingenious Dr Haller, by 
injecting quickfilver from the vas deferens, in 
the manner’ propofed by my father in the 
Medical Efjays*, and caufing it to pafs as far 
as the tefticle, has been able to explain to us, 
with greater accuracy, the ftructure of this 
intricate organ +. He agrees with De Graaf, 
that the epzdydimis, from the vas deferens to 
its head, {eems to be compofed of a fingle 
pipe, which he thinks might poffibly be un- 
loofened, as De Graaf has reprefented ; but 
does not affirm his having executed it. At 
its head indeed, he could divide it into ten or 
more vafcular cones, from which veffels go 
out, that, after forming a network with com- 
munications, give off ftreight pipes which 
feem to plunge into the body of the tefticle. 
—His injection here generally failed, tho’ he 
~ fometimes obferved, that it entered a few con- 
voluted 
* Vol. v. Art. xx. § 29. 
Ft Phil. Tranf No. 494. § xii. 
