take delight in showing all sorts of variation from their Eastern cousins. Our lower forms of plant life, which are very numerous, have not yet been thoroughly investigated or described, but it is to be hoped that Mr. Howell will receive enough encouragement to induce him to write a second volume which will describe these lower forms.
Bibliography of sources of material not mentioned in the paper:
David Douglas: Journal of Mr. Douglas's travels in Hooker's Companion to the Botanical Magazine, Vol. II., London.
David Douglas, Botanist, Leisure Hour, Vol. 32, page 206. London.
Discoverer of the Giant Pines, Leisure Hour, Vol. XL, page 454. London.
An Early Hero of the Pacific, Overland Mo., August, 1871.
Thomas Nuttall: Popular Science Mo., Vol. 46, page 689, 1895.
U. S. Exploring Expedition Reports:
Vol. XV. Botany, Phanerogamia, by Asa Gray, published 1854-56.
Vol. XVI. Botany, Cryptogamia, by W. D. Brackenridge, published 1854-56.
Vol. XVII. Botany, Phaenogamia, by John Torrey, published in 1874.
