SCIENCE. 



iii 



CLUB RATES. 



Analyst 



Appleton's Monthly 



American Naturalist 



American Journal of Science 



American Journal of Microscopy 



American Machinist 



American Monthly Microscopical Journal 

 American Manufacturer and Iron World. 



Boston Journal of Chemistry 



Chicago Medical Review 



Chicago Field 



Druggist 



Druggists' Circular 



Educational Monthly (Barnes ) 



Engineering News 



Engineering and Mining Journal 



Education ., 



Engineering Magazine 



Harper's Magazine 



Harpers Weekly 



Harper's Bazar 



Harper's Young People 



Humboldt Library 



International Review 



Subscrip- 

 tion. 



$2.00 

 3.00 

 4.00 

 6.00 

 1. 00 

 3.00 

 1. 00 

 4-25 

 1. 00 

 2.00 

 4.00 

 1.60 

 1.50 

 1.50 

 3.00 

 4.00 

 4.00 

 5.00 

 4.00 

 4.00 

 4.00 

 1.50 

 3.00 

 5.00 



With 



Science. 



$5.50 

 6.26 

 7.20 

 8.50 

 4.70 

 6.70 

 4.80 

 7.00 



4- 7S 



5- 5° 

 7.0O 



5-25 

 5-25 

 5.20 

 6.25 

 7.00 

 7.00 

 8.25 

 7.00 

 7.20 

 7.20 

 5.20 

 6.25 

 8.00 



Iron 



Journal of the Telegraph _ 



London Lancet _ 



Magazine of American History 



Mining and Scientific Press 



Nature... 



N. Y. Medical Journal 



New England Journal of Education 



North American Review 



Operator 



Popular Science Monthly 



Sanitary Engineer 



Practical American 



Pacific Rural Press 



Scribner's Monthly 



Science Observer. 



Scientific American 



" Supplement 



" _ " with Supplement 



Southern Medical Record. 



Student 



St. Nicholas 



Young Scientist 



Subscrip 

 tion. 



7-5° 



9-34 



2.00 



5-50 



5.00 



7.50 



5.00 



8.00 



4.00 



6.40 



6.00 



9. is 



4.00 



7.00 



3.00 



6.40 



5-°o 



7-75 



1. 00 



4.80 



5.00 



8.00 



3.00 



6.50 



1.50 



5.00 



4.00 



7.00 



4.00 



7,20 



■5° 



4.40 



3.20 



6.56 



5.00 



8.00 



7.00 



9.60 



2.00 



5-4° 



1. 00 



4-75 



3.00 



6.40 



•50 



4-3° 



Dr. Scott's Electric Hair Brush. — A good hair brush cannot be bought for 

 much less than the sum for which Dr. Scott's electric brush can be secured. 

 This brush, aside from the curative properties claimed for it, is a well made arti- 

 cle, handsome in appearance and first-class in every respect. It is not a metallic 

 brush, but is made of pure bristles. Its electrical qualities are very strong, and 

 will manifest themselves by causing the needle of a magnetic compass to vibrate 

 even with a thick book on the top of a table intervening. Violent vibrations of 

 the needle can be caused by passing the brush quickly back and forth within 

 four or five inches of the compass. It is claimed for this brush that its use will 

 cure headaches and neuralgia, will remove dandruff, and in most cases will pre- 

 vent the hair from falling or turning gray. In support of this claim many testi- 

 monials from responsible persons are adduced. Evidently its use would be of 

 great benefit wherever electricity would prove beneficial, and could not in any 

 event result in harm. — Boston Journal, May 28, 1881. 



SCIENCE 



A WEEKLY JOURNAL OF SCIENTIFIC PROGRESS. 



Vol. II, Mo. 71, 



November 5, 1 881 . 



CONTENTS. 



Science and Medicine (Edit.); Proceedings New York Academy of Sciences, October 

 3 and 10, 1881 ; State Microscopical Society of Illinois (Report) ; Retarded Develop- 

 ment of Insects, by Prof. C. V. Riley ; On the Life Duration of the Heterocera 

 (Moths), by Prof. G. A. Lintner ; Fine Ruling on Glass, by Mr. Fasoldt ; Electric 

 Rail Roads (three illustrations); Mechanical Science, by Sir Win. Armstrong; 

 Another Confirmation of Prediction, by Pliny Earles Chase ; Meteorological Report, 

 by Prof. Daniel Draper, Ph. D.; Correspondence ; Letter from Prof. J. E. Hen- 

 dricks. 



BUY THE BEST. 



POST & CO'S 



AMERICAN STUDENT LAMP. 



GUARANTEED THE BEST. 



?0ST & CO., M'F'RS & PATENTEES, CINCINNATI, OHIO. 



Nickel Plated Double Lamps $10.00 each. 

 Nickel Plated Single Lamps $5.00 each. 



SENT C. 0. D. ANYWHERE. 



Send for Illustrated Catalogue. 



POST k CO, Cincinnati, Ohio. 



