388 
Plant Diseases—Report on the experiments made in 1891 tn the 
Treatment of. (U.S. Depart. Agric. Washington, 1892. Il- 
lustrated). 
Plantain—A Rare. H. P. Keyes (Gard. & For. v. 550). Note 
on the discovery of Plantago media, at Framington, Maine. 
Post Laramie Beds of Middle Park, Colo. Whitman Cross. (Read 
before the Colo Sci. Soc. Oct. 3, 1892. Pamph. 8vo, pp. 27). 
Under the heading, ““ Age of the Middle Park Bed,” the author 
utilizes the evidence afforded by fossil plants to determine the age 
of certain beds. He criticises their reference by Lesquereux to 
the Laramie Lignitic group and shows that this reference was 
probably due to an attempt to make the plants fit in the place 
where the stratigraphical geologists thought they ought to belong, 
combined with a manifest disarrangement of labels. A careful 
revision of the specimens upon which Lesquereux’s conclusions 
were founded, in addition to new material since collected leads 
the author to conclude that the Middle Park beds are post-Lara- 
mie in age. AA list of twenty-eight species of fossil plants is in- 
cluded. A. H. 
Quercus densifiora (Gard and For. v. 517. Illustrated). 
Rudbveckia hirta, L—A. Monstrous Specimen of. J. T. Roth- — 
rock (Contr. Bot. Lab. Univ. Penn. i. 3. Illustrated). 
Sequoia gigantea—A Museum Specimen of (Gard. & For. v. 45 1.) 
Two illustrations and a most realistic description of the felling — 
of one of the giant Redwoods in Fresno Co. Calif. are given. The 
particular tree figured girthed sixty-two feet at eight feet from 
the ground and ninety feet at the surface anda section of the 
trunk twenty feet in diameter is now on exhibition in the Jesup 
collection of American woods in the American Museum of Natural — 
History. | 
The Flora of the Dakota Group. A posthumous work by Leo 
Lesquereux. Edited by F. H. Knowlton, (Monograph no. 
xvii, U.S. Geol. Survey, pp. 400, including 66 plates. Wash- 
ington, 1891). . 
In this volume we have the latest contribution to our knowl- 
edge of the cretaceous flora of North America. The work will 
always be known as that of Prof. Lesquereux, but the laborious 
and thankless work of the editor should not be lost sight of. The 
