■^5 



Eleventh Year. 

 Vol. XXII. No. 569. 



DECEMBER 29, 1893. 



Single Copies, Ten Cents. 

 $3. 50 Per Year, in Advance. 



Contents 



Frost Plants: A Resume. D. T. Macdougal . . 351 



Quantitative Comparisons; A Common Error 



of Language. George H. Johnson, Sc. D . , 352 



Variation in Spores of Corn Smut. A. S. Hitch- 

 cock 353 



On the Measurement of Hallucinations. E. W. 



Scripture and C. E. Seashore 353 



On Root Hairs. Th. Jamieson 354 



Laboratory Work by the Student of Chemis- 

 try Should Be Subordinate and Auxiliary 

 to the Development of Facts. Principles and 

 Theories by the Teacher. R.W.Jones 357 



Origin of the Hydrocarbons. Marcus E. Jones. 358 



Birds Seldom Seen in South Carolina. Prof. J. 



C. Hartzell, Tr 359 



A New Mite Infecting Mushrooms. Herbert 



Osborn 360 



The Arctic Current in the Estuary of the St. 



Lawrence. Andrew T. Drummond 360 



Letters to the Editor: 



A Rope of Ma.ggots. Lynds Jones 361 



Singular Behavior of an Owl. E. J. Hill. . . 361 



On Carib Migrations. D. G. Brinton 361 



Pocket Key of the Birds of the Northern 

 United States. Austin C. Apgar 361 



Book-Reviews 362 



Notes and News 363 



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