402 ESSAYS -anp OBSERVATIONS 
vain to difcover this by maceration in water ; 
nor have anatomifts fince his time been more 
fuccefsful. 
I have endeavoured feveral times to force 
quick-filver from the fpermatic arteries into 
the feminal veflels ; but, tho’ I made it re- 
turn by the {permatic veins, I could never 
caufe it to pafs into thefe convoluted tubes. 
Tuis J attempted the oftener, becaufe of 
the feeming probability of our being able to 
determine, better in this than in other glands, 
whether fecretion is performed in continued 
cylindrical canals, according to Ruy/ch, or, 
by the intervention of follicles, with Mai- 
pighius; fince we can feparate the parts of 
the tefticle, without cutting, and even al- 
moft without laceration. 
