EDITORIAL NOTES. 
THE Popular Science Monthly is always wel- 
come, but the February number is especially 
attractive, as will be seen from the following 
abstract of its contents: The Development 
of Political Institutions, by Herbert Spencer. 
IV. Political Differentiation.—Origin of the 
Plow and Wheel Carriage, by E. B. Tylor, 
F,R.S.  (Illustrated.)— Physical Education, 
by Felix L. Oswald, M. D. II. Diet (contin- 
ued. )—Horses and Their Feet, by Sir George 
W. Cox.—Domestic Motors, by Charles M. 
Lungren. III. Gas and Electric Engines. 
(Illustrated.)—The Value of Accomplish- 
ments, by William A. Eddy.—Darwin on the 
Movement of Plants, by Eliza A. Youmans: 
(Illustrated.) — Atmospheric Electricity, by 
Prof. H. S. Carhart.—Optical Illusions of 
Motion, by Silvanus P. Thompson, B. A., D. 
SC, (Ilustrated.)—Evolution of the Chemi- 
cal Elements, by Lester F. Ward.—Only a 
Vine-Slip, by Thomas G. Appleton.—The 
November Meteors, by Prof. Daniel Kirk- 
wood.—Prehistoric Science en Fete.—Sketch 
of Count Pourtales. (With Portrait.) —Editor’s 
Table.—Literary Notices.—Popular Miscel- 
lany.—Notes. 
THE Saturday Herald, recently enlarged 
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THSTIMONIALS. 
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THEO. S. CASE, Esq. : 
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