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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), others crooked (C).
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Book3-17.jpg/420px-Book3-17.jpg)
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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/78/Book3-18.jpg/420px-Book3-18.jpg)