SCIENTIFIC AMERICAN SUPPLEMENT NO. 829

NEW YORK, November 21, 1891.

Scientific American Supplement. Vol. XXXII, No. 829.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

TABLE OF CONTENTS.
I.	ASTRONOMY.—The Sun's Motion in Space.—By A.M. CLERKE.—Avery interesting article on the determination of this hithertouncertain factor.
II.	BOTANY.—Hemlock and Parsley.—By W.W. BAILEY.—Economic botany of Umbelliferæ.
	Raphides—the Cause of the Acridity of Certain Plants.—ByR.A. WEBER.—Effect of these crystals on the expressed juicefrom calla and Indian turnip and other plants.
	The Eremuri.—A very attractive flower plant forgardens.—1 illustration.
III.	DECORATIVE ART.—The Decorative Treatment of NaturalFoliage.—By HUGH STANNUS. The first of a series of lecturesbefore the London Society of Arts, giving an elaborateclassification of the principles of the subject.—5illustrations.
IV.	ELECTRICITY.—The Independent—Storage or Primary Battery—Systemof Electric Motive Power.—By KNIGHT NEFTEL.—Abstract of arecent paper read before the American Street Railway Associationon the present aspect of battery car traction.
V.	GEOGRAPHY.—The Colorado Desert Lake.—A description of the newoverflow into the Colorado Desert, with the prognosis of itsfuture.
VI.	GEOLOGY.—Animal Origin of Petroleum and Paraffine.—A pleafor the animal origin of geological hydrocarbons based onchemical and geological reasons.
	The Origin of Petroleum.—By O.C.D. Ross.—A further and morelengthy discussion in regard to petroleum and theory of itsproduction by volcanic action.
VII.	GUNNERY.—Weldon's Range Finder.—An instrument for determiningdistances, with description of its use.—3 illustrations.
VIII.	MECHANICAL ENGINEERING.—Mercury Weighing Machine.—Atype of weighing machine depending on the displacementof mercury.—1 illustration.
	Wheels Linked with a Bell Crank.—Curious examples ofmechanical constructions in the communication of motionbetween wheels.—3 illustrations.
IX.	MEDICINE AND HYGIENE.—Cold and Mortality.—By Dr. B.W.RICHARDSON.—The effect of cold upon the operation of theanimal system, with practical rules.
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