He was especially interested in seeing Torreya, a fine tree named for his friend Dr. Torrey, which is only known in one or two localities in Florida, on the banks of the Apalachicola River; and with some trouble he found it growing, and had the satisfaction of hoping that it was valued enough to be preserved. There is a second Torreya growing in Japan, a third Torreya in California, and a fourth in China. “But,” as Dr. Gray says, “any species of very restricted range may be said to hold its existence by a precarious tenure. The known range of this species is not more than a dozen miles in length along these bluffs, although Dr. Chapman has heard of its growing farther south, where the bluff trends away from the river.” He went to Stone Mountain in Georgia, a curiously bare, immense mass of stone, one side too steep to climb, but having in clefts some rare plants growing. From Chattanooga he made an excursion up Lookout Mountain, interesting from its reminiscences of “Sherman’s March,” and also the habitat of some rare plants he was so fortunate as to find. TO WILLIAM M. CANBY. BOTANIC GARDEN, March 13, 1875. MY DEAR CANBY,--I do not get on, and shall not in this melting snow and bad season. I yield to advice, and Mrs. Gray and I are going South,--I do not know where, but somewhere, taking my vacation now instead of in summer. I want to find now--and reach comfortably--what we have here at the first of June. You know somewhat of the South; I think I should like best to get to Apalachicola and St. John’s River and see Torreya. But it seems far off. I want to recruit, and to be good for something, which at present I am not! SMITHSONIAN INSTITUTION, WASHINGTON, April 25, 1875. MY DEAR CANBY,--Well, we have got back again, so far; and here, I think, we shall stick for a few days. Had we anticipated so much cold and backwardness, we should have stayed south longer. Apalachicola was heavenly. But at Macon, coming north, we struck the cold wave; came on by Atlanta (Stone Mountain), Chattanooga (roots of Silene rotundifolia), and thence via Lynchburg straight here. I found Torreya, and had a good time with it. Lots of detail to tell you.... I am lazy in traveling, or I would have written you. Then I have been pretty busy, too, and have done several hard days’ work, causing much but healthy fatigue. CAMBRIDGE, May 8. We are at home, with delightful memories of you and yours. I think I hinted to you that I found two Crassulaceæ on Stone Mountain, both annual. One, most abundant on the lower slopes, is glaucous-green, and has bright white flowers. The pods show it to be a true Sedum. I send a small specimen. Note the blunt pods and short style. This--as shown by a bit of fruit in my herbarium--is Sedum pusillum, Michx.! The other is dull purple in general hue, smaller, grows only well up the mountain, abounds in a small form on the very top, and is rather later; but I make out the dehiscence, and it is Diamorpha pusilla, Nutt.!