October 30, 1891. J 



SCIENCK. 



251 



sion of points of economic theory, and there is a short paper on 

 the Toronto street railway. A note announces a forthcoming re- 

 print of Cantil Ion's celebrated essay on commerce. 



— Professor W. O. Atwater of Wesleyan University contributes 

 an article to the November Century on " The Food Supply of the 

 Future," the first in a series which will have especial value to 

 farmers. The writer believes that the doctrine of Malthus — 

 that the time will come when there will not be food enough for 

 the human race, owing to the theory that population increases in 

 a geometrical and food-supply in an arithmetical ratio — is one 

 which need never give the world any uneasiness, owing to the 

 great advances that are being made in chemistry. Science has 

 shown what are the essential factors in vegetable production, and 

 plants can now be grown in water or in sand by adding the proper 

 chemicals. Professor Atwater gives the result of an interesting 

 experiment recently made in his laboratory. Sea sand was 

 brought from the shore of Long Island Sound. To divest it of 



every possible material which the plant might use for food except 

 the sand itself, it was carefully washed with water and then 

 heated. It was put into glass jars, water was added, and minute 

 quantities of chemical salts were dissolved in it. Dwarf peas, 

 planted in this sand, grew to a height of eight feet, while peas 

 of the same kind, planted by a skilful gardener in the rich soil of 

 a garden close by, reached a height of only four feet. 



— In Lippincott's Magazine for November, two articles that 

 will be read with interest are "The Evolution of Money and Fi- 

 nance," by J. Howard Cowperthwait, and "The Restoration of 

 Silver," by John A. Grier. The first is a strong plea for gold only 

 as a standard measure of value. Mr. Grier, from the bi-metal- 

 lisfs point of view, attacks this article, and puts in a plea for the 

 equal use of both gold and silver as a measure of value. The 

 " silver question " is one which every American should under- 

 stand, and the best way to understand it is to look at both sides of 

 the question. 



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