Which preposition to use with yam

in Occurrences 3%

When I found he was still obstinate, not knowing whether it was from sulkiness or insanity, I ordered a person to present him with a piece of fire in one hand, and a piece of yam in the other, and to tell me what effect this had upon him.

for Occurrences 2%

Cook says it was hard to say which was the most valuable, the yams for food or the sticks for firewood; but, as for the fish, "it might serve to please the sight, but was very offensive to the smell, as some of it had been kept two or three days for this occasion."

to Occurrences 2%

The same soil which ordinarily produced ten cart-loads of yams to the acrethe present season barely averaged one load to ten acres!

from Occurrences 1%

The first cutter was sent to Brierly Island today, for the double purpose of endeavouring to procure yams from the natives for the use of the ship's company, and enabling me to make additions to my vocabulary and collection.

on Occurrences 1%

Thus a promising people is committing race-suicide; for this sort of thing goes on not only in connection with this particular problem, but over such questions as the number of beads to wear round one's neck when visiting the medicine-man, whether the national custom of saluting the rising sun need be observed on cloudy mornings, and whether the medicine-man is entitled to the pick of the yams on any day but Sunday.

Which preposition to use with  yam