We there procured large quantities, and some large crystals.
"This strontian was on the south side of Moss Island, in a horizontal vein of three feet in thickness, and from forty to fifty feet in length.

I had no means of judging its depth into the rock.

The base of the island is wholly composed of limestone, in which shells scarcely, if ever, appear." _Conchology--Mineralized Fungus, &c._--Dr.Samuel L.Mitchell, of New York, writes (Jan.

30th): "I was glad to receive your letter and the accompanying articles, by the hand of Colonel Gardiner; but I am sorry your business is such as to prevent your meditated visit to the city until spring.
"I had a solemn conference with Mr.Barnes, our distinguished conchologist, on the subject of your shells.

We had Say's publication on the land and fresh water molluscas before us.