August 5, 1892. J 



SCIENCE. 



— D. Van Nostrand Company will publish in the fall in their 

 Science Series " A French Method of Obtaining Slide-Valve Dia- 

 grams,'" by Lloyd Banston, Ass't Naval Constructor, U. S. Navy, 

 and " A Graphical Method for Swing Bridges," by B. F. La Rue. 



— Professors W. J. Beal and C. F. Wheeler have prepared for 

 the thirteenth annual report of the State Board of Agriculture of 

 Michigan a catalogue of plants of the State. It contains 180 

 pages, and is much more than a mere list. In the 114 orders 

 represented, these including the phanerogams and vascular crypto- 

 gams, there are 554 genera and 1746 species and varieties. A map 

 showing the provisional districts into which the State is divided 

 is prefixed to the catalogue. The distribution of each plant is 

 mentioned, and remarks are rhade upon many species. It is only 

 possible to refer to some of the numerous topics touched upon in 

 the introductory remarks. Among them we find a general de- 

 scription of the topography of the State, with lists of the plants 

 4?haracteiistic of the ten districts, lists of the plants occurring in 



the "Jack-pine plains," the prairies, and in the eastern and west- 

 ern sides of the State in the latitude of 44° 40'. There are also 

 valuable hints in regard to the trees best adapted for planting 

 aliout the home and along the roadside; planting a wild garden ; 

 trees and shrubs noted for the color of their foliage in autumn ; 

 native climbing plants; plants indicating a fertile soil; trees valua- 

 ble for timber; native and introduced weeds; rare or local 

 plants; medicinal plants, etc. Not the least interesting topic is 

 that relating to wild fruits and nuts, the remarks of Dr. Asa 

 Gray made in 1873 being quoted. He speculated upon what the 

 results would have been if our civilization had had its origin in 

 North America instead of the Old World. Apples would have 

 developed from the wild crab; plums from several wild species; 

 the persimmon, the paw paw, the ground nut, hickory nut, and 

 walnut would hold the places now filled by others; and perhaps 

 3,000 or 3,000 years hence some of these will have taken a 

 front rank among the edible fruits of the then existing races of 

 men, 



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