Life and Letters of Charles Darwin, volume 2 includes the following letter from Darwin to Hooker, written with regard to a paper which Darwin had sent to Linnean Society:
"I have sent my paper on dimorphism in Primula to the Linn. Soc. I shall go up and read it whenever it comes on; I hope you may be able to attend, for I do not suppose many will care a penny for the subject."
Does "come on" here mean "when the society accepts to discuss it"?