The Digital Tradition and several Websites have "'neath the midnight sun," but just as many have "in the midnight sun." I have two printed Robert W. Service anthologies, and both have in. I think I'll stick with in until somebody provides incontrovertible proof that my printed sources are wrong.
Rosetti's "Goblin Market" is here (click), or you can download a whole book of Christina Rosetti poetry at Project Gutenberg.
-Joe Offer-