fling on to

[Sukhomvit]

I cam across this sentence in Out of Africa by I. Dinensen:

"He was a rousing farmer and helped me in the work of the farm in word and deed, more than any other man in the country,—with a simple vigorous readiness as if it were standing to reason that farmers, or Scandinavians, were to slave for one another. Here he was now flung on to the farm by his own burning mind, like a stone out of a volcano."

I could not find out the meaning of "fling on" in any dictionary. Please someone help me out. Thanks.

 

[Raymott]

"Fling on" is not the phrase. He was flung [on to (or onto) the farm].
"He flung the dart onto the dartboard; the dart was flung onto the dartboard."
"He flung the stone into the water; the stone was flung into the water."

I don't know why this author uses "on to" for "onto". They are variants of the same thing.