[24] It also often has the distribution of a certain number of public documents of scientific value. I am about to ask its secretary to procure for you, if possible, a copy of Frémont’s two reports, which you desire,--if too late to procure it gratis, as I fear, to purchase the volume at my expense.--A. G. [25] Thaddeus Wm. Harris, 1795-1856; librarian of Harvard College and a distinguished entomologist. [26] Dr. Gray sent to Kew manilla paper for the genus covers in the herbarium. [27] George Thurber, 1821-1890; born in Providence; botanist to the United States and Mexican Boundary Survey Commission; then in the Assay Office in New York; later, editor of the _American Agriculturist_; a student of grasses. [28] From a letter to Sir W. J. Hooker: “Curious that this correspondence, after lying so long, should at length be printed and published in New England.”--A. G. [29] Charles W. Short, M. D., 1794-1862; professor of materia medica in the University of Transylvania, Lexington, Ky. Removed later to Louisville. Dr. Gray named for him Shortia galacifolia, discovered in Michaux’s herbarium in Paris, in 1839. [30] On the 2d July, 1872, Dr. Gray saw the Calaveras and Mariposa groves. In the Calaveras Grove he counted, with one of his fellow-travelers, the rings and took measurements of the fallen tree “Hercules.” His memoranda of the size, etc., were:-- Height when standing was 315 feet. A section at 21 feet from ground was 6 feet 10½ inches radius, on the line counted. Layers| Rate of growth. Counted on it 1,500|First century 10¼ in. radius Uncounted sapwood (est.) 30| “ 400 years 27¼ “ “ “ centre “ 10|Last century 3½ “ “ Growth to 21 feet “ 10|Last 400 years 14 “ “ ----| Estimated age (years) 1550| [31] _First Lessons in Botany._ [32] Isaac F. Holton, M. D., 1813-1874; teacher and professor of natural science in Vermont, and missionary pastor in Illinois. Published in 1857 _New Granada, Twenty Months in the Andes_. [33] _A Journey in the Seaboard Slave States, with Remarks on their Economy._ By Frederic Law Olmsted. New York, 1856. [34] William Darlington, M. D., 1782-1863, of West Chester, Penn.; author of _Flora Cestrica_, “one of the best of local Floras,” and _Memorials of Bartram and Marshall_, etc. “A most faithful botanist. His forte was the clear and accurate description of plants” [A. G.]. [35] Thomas Potts James, 1804-1882. Born in Radnor, Penn. A proficient and authority in bryology. [36] _First Lessons._ [37] _How Plants Grow._ Sir Joseph Hooker in _Nature_, February 16, 1888, says of _How Plants Grow_ and _How Plants Behave_, “that for charm of matter and style they have no equal in botanical literature.” [38] Daniel Cady Eaton, professor of botany at Yale. [39] _Botanical Gazette_, March, 1888.