...Mersh, of Luxemburgh, in the suite of Sir Wm. Stswart ; so I noted it down in my journal, as M. Mershii. A third species of Mammillaria I found on the Oregon...London, and Mr. Scheer, at Kew, has already raised ssveral from seeds. The above mentioned Mel-icactus was gathered by Chief-factor Macdonald, at Fort...