Volume VII. No. 168 



April 23, 1886 



SCIENCE 



Comment and Criticis?n. — A statement of the fundamental principles of the new school of economists. — 



Tornadoes and their prediction. — Thoughtless book-making ........ 361 



Government surveys ............. 363 



Health of New York during March 363 



Popular astronomy ............. 365 



Geographical notes .367 

 Astronomical notes 368 



Notes and News. — The Annisquam laboratory. — Mr. Alfred Russell Wallace's visit to the United 

 States. — The occurrence of singular insects in Washington. — Silk-culture in the United States. — 

 The attendance at Fresenius' laboratory. — Petroleum-wells near the Red Sea. — The phylloxera in 

 California. — A new explosive ........... ... 36S 



Letters to the Editor.. 



New York agricultural experiment-station. — C. 



E. Thome 371 



Settlement o f labor differences. — Chas. Field . 372 

 Eskimo building-snow. — T. W. Sherwood . 372 

 Quaternary volcanic deposits in Nebraska. — J. 



E. Todd 373 



World time. — Asaph Hall . . . . 373 



Certain questions relating to national endowment 

 of research in this country, and their impor- 

 tance. — R. W. Shufeldt .... 374 



The American ornithologists' union code and 

 check-list of American birds. — A. 0. U. com- 

 mittee on classification and nomenclature . 374 



SCIENCE SUPPLEMENT. 

 Change in the tenets of political economy with time . . Edwin R. A. Seng man 375 



The Science Company y Publishers, New York, 



743 Broadway. 



Price 15 cents. 



