Which preposition to use with emissions

of Occurrences 27%

Some children are stronger in the enduring power of the stomach than others, and get rid of the excess by vomiting, concluding every process of suckling by an emission of milk and curd.

from Occurrences 1%

The former they considered and called 'spirit', and believed it to be an emission from the Almighty Father of Spirits: the latter they called 'body'; and in this sense they doubtless believed in the existence of incorporeal beings.

Which preposition to use with  emissions