October 7, 1910] 



SCIENCE 



461 



will be given of certain phases of the geology 

 of northern New England, and questions will 

 be raised upon which the subsequent field trip 

 should throw light. Opportunity will be given 

 to inspect Hitchcock's large geological model 

 of New Hampshire and Vermont (scale 1 inch 

 to one mile), the various rock collections made 

 during the progress of the State Surveys of 

 1861-79, Dr. Hawes's original set of " thin " 

 sections of New Hampshire rocks, Warren 

 Upham's original maps of the surface deposits 

 of the Connecticut and Merrimac valleys, and 

 other exhibits at the Dartmouth College Mu- 

 seum which illustrate pioneer work on the 

 geology of northern New England. 



On Saturday morning short excursions will 

 be made to several points in the valley near 

 Hanover, and in the afternoon to the vicinity 

 of White River Junction. Some of the fea- 

 tures to be seen and questions to be discussed 

 are: The Connecticut valley esker; its rela- 

 tion to other deposits in the valley? Clays, 

 which compose the " highest terrace " ; their 

 original extent? of glacio-fluvial or glacio- 

 lacustrine origin? Deltas at mouths of tribu- 

 tary valleys, at altitudes above the " highest 

 terrace " ; their significance ? Ice-contact 

 slopes and kettle-holes, how discriminated 

 from subsequent stream-carved topography? 

 Erosion slopes of the Connecticut River, local 

 trimming and local obliteration of the esker; 

 intercision of a tributary stream by the master 

 stream at a point some distance above their 

 original junction; protective influence of 

 ledges among the terraces? Unprotected ter- 

 races and abandoned courses (of incised 

 meandering pattern) of tributary streams. 

 Accordant altitudes of unprotected terraces 

 up- and down-valley. Do some of these repre- 

 sent long pauses between stages of regional 

 up-warping? Was the post-glacial elevation 

 of New England steady and continuous, or 

 interrupted by an interval of halting or sub- 

 sidence? 



The field excursion will close at White River 

 Junction before the departure of the 5.35 p.m. 

 train for Boston. 



Herdmax F. Cleland, 

 WiLLiAMSTowN, MASS., Secretary 



September 24, 1010 



THE ILLUMINATING ENGINEERING 

 SOCIETY 

 The fourth annual convention of the H- 

 luminating Engineering Society will be held 

 October 24 and 25, 1910, in Baltimore, Mary- 

 land. The convention will meet at the Johns 

 Hopkins University. 



Following the two days convention there 

 will be given at the university a course of 

 thirty-six lectures on illuminating engineer- 

 ing. These lectures will be given in the phys- 

 ical laboratory from October 26 to November 

 8. A large number of those who will attend 

 the convention have already arranged to take 

 advantage of the opportunity offered by the 

 lecture course. The lecturers have been in- 

 vited by the university upon the advice of the 

 society. 



Plans are rapidly maturing for the conven- 

 tion proper. There will be two sessions on 

 each day of the convention — morning and 

 afternoon. On Monday evening there will be 

 a public lecture in McCoy Hall to be followed 

 at 9.30 by a reception in the physical labora- 

 tory and an exhibition of the apparatus to be 

 used in the lecture course. On Tuesday even- 

 ing there will be a banquet which will con- 

 clude the convention. 



The lectures on illuminating engineering 

 are as follows: 



" The Physical Basis of the Production of 

 Light" (three lectures), Joseph S. Ames, Ph.D., 

 professor of physics. The Johns Hopkins Uni- 

 versity. 



" The Physical Characteristics of Luminous 

 Sources" (two lectures), Edward P. Hyde, Ph.D., 

 president. Illuminating Engineering Society; di- 

 rector of Physical Laboratory, National Electric 

 Lamp Association. 



"The Chemistry of Luminous Sources" (one 

 lecture), Willis R. Whitney, Ph.D., director of 

 Research Laboratory, General Electric Co.; past 

 president, American Chemical Society. 



"Electric Illuminants" (two lectures), Charles 

 P. Steinmetz, Ph.D., consulting engineer, General 

 Electric Co.; professor of electrical engineering. 

 Union University. 



"Gas and Oil Illuminants" (two lectures), 

 (1) M. C. Whitaker, B.S., M.S., professor of in- 

 dustrial chemistry, Columbia University. (2) 

 Alexander C. Humphreys, M.E., Hon. Sc.D., presi- 



