62 BOOK III. 



Also the veins which we call profundae 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), other? crookedl(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. 



