824 



SCIENCE. 



[N. S. Vol. XXIV. No. G25. 



ican ' ice storm.' ' The Meteorological Optics 

 of Professor J, M. Pernter ' is a review of 

 Pernter's standard work, recently published, by 

 Professor R. W. Wood. ' The Meteorological 

 Conditions Associated with the Cottage City 

 Waterspout' (August, 1896), by Professor F. 

 H. Bigelow. A full review and discussion of 

 the weather conditions leads to the conclusion 

 that a sheet of cold air, in front of an ap- 

 proaching anticyclone, overran the lower, 

 warmer air, the cold air following at the sur- 

 face a few hours later. This gave ' the exact 

 conditions required to produce the observed 

 powerful convection.' ' Variation in Tempera- 

 ture over a Limited Area,' by Professor W. I. 

 Milham, of Williams College, embodies the 

 results of studies at Williamstown, Mass., 

 supplementary to those previously discussed 

 in the Monthly Weather Review (July, 1905) 

 by the same writer. * Monthly Review of 

 the Progress of Climatology throughout the 

 World.' This is a comparatively recent addi- 

 tion to the regular contents of the Review; 

 the notes are prepared by C. F. Talman, and 

 will be found useful by teachers of meteorol- 

 ogy and climatology. ' The First Daily 

 Weather Map from China,' by the same 

 writer, notes the publication of this new map 

 on July 1, 1906. 



CLIMATE OF FORT GRANT, ARIZONA. 



We note the publication of a paper on ' The 

 Climate of Fort Grant, Graham County, Ari- 

 zona ' in the Journal of the Outdoor Life for 

 November. The writer is Dr. I. W, Brewer, 

 and special attention is paid to the relations 

 of this climate to disease. 



R. DeC. Ward. 



EVENING TECHNICAL COURSES AT 

 COLUMBIA UNIVERSITY. 



The Board of Extension Teaching of Co- 

 lumbia University announces a series of nine 

 evening technical courses which will be given 

 at the University this winter, beginning De- 

 cember 3, and lasting twenty weeks. The 

 courses are under the immediate direction of 

 Professor Walter Rautenstrauch, of the Fac- 

 ulty of Applied Science, and are to be given 



by professors and instructors of the university 

 and other persons especially qualified. Mod- 

 erate fees ($7.50 to $15) are charged and 

 most of the courses are for two evenings a 

 week. The courses are as follows : 



Engineering Physics. — As illustrated in the 

 mechanical plants of modern buildings. ( 1 ) An 

 elementary study of physics: (2) a practical 

 study of steam and electrical machinery, heating, 

 ventilating, water system, wiring, elevators, etc., 

 included in the plant of Columbia University. 

 For two classes of students: those wishing an 

 introductory study of physics as preparation to 

 advanced study in electricity, steam, etc., another 

 winter; those desiring practical training for posi- 

 tions as superintendents of buildings, engineers, 

 janitors, etc. 



Elementary Mathematics. — Those parts of 

 arithmetic, algebra, geometry and trigonometry 

 used in technical work. Practice with engineer- 

 ing hand-books, tables, etc. 



Drafting. — A beginner's course; fits for posi- 

 tions as draftsmen; reading of drawings, etc. 



Strength of Materials. — ^A lecture course for 

 those who design or manufacture machinery, or 

 modern structures. With this course should be 

 taken either the first or second of the two follow- 

 ing courses in design. 



Machine Design. — ^Advanced drafting, com- 

 putations, and designing for persons engaged in 

 the design and manufacture of machinery. 



Structural Design. — ^Advanced drafting, compu- 

 tations, and designing for those who do structural 

 work. 



Electrical Engineering. — ^A course especially for 

 those engaged in electrical work of any sort. 



Steam Engineering. — A course for those en- 

 gaged in the manufacture or management of steam 

 machinery of any sort. 



Special Engineering Problems. — A study of any 

 special elementary or advanced engineering prob- 

 lems desired by the student: Individual instruc- 

 tion will be arranged for such a period of time 

 as the special problem may demand. 



The courses will be given in the buildings 

 of Teachers College, Columbia University, at 

 West 120th Street and Broadway, which af- 

 fords necessary lecture rooms, laboratories, 

 drafting rooms, etc. A complete catalogue of 

 these courses will be sent on request, by ad- 

 dressing Evening Technical Courses, Exten- 

 sion Teaching, Columbia University. Per- 

 sonal information may be secured on Tuesday 



