62 
BOOK III. 
Also the veins which we call pro/undue differ in the manner in which 
they descend into the depths of the earth; for some are vertical (A), some are 
inclined and sloping (B), others crooked (C). 
Moreover, venae profundae (B) differ much among themselves regarding 
the kind of locality through which they pass, for some extend along the 
slopes of mountains or hills (A-C) and do not descend down the sides. 
