262 



SCIENCE 



[N. S. Vol. XL VI. No. 1185 



Dr. Truman Lee Kellet, of the University 

 of Texas, has been elected assistant professor 

 of education at Teachers College, Columbia 

 University. Dr. Kelley is to devote a large 

 part of his time to research on psychological 

 measurements in secondary education. 



Northwestern Uiversity Medical School 

 announces the following faculty appointments 

 for 1917-1918 : Drs. Frederick G. Harris, pro- 

 fessor of dermatology and syphilology, suc- 

 ceeding Professor Joseph Zeisler, who becomes 

 professor emeritus of dermatology; Frank C. 

 Becht, professor of pharmacology, succeeding 

 Professor Hugh McGuigan ; John Eidlon, hon- 

 orary professor of orthopedic surgery; John L. 

 Porter, professor of orthopedic surgery; Her- 

 bert A. Potts, professor of oral surgery; Frank 

 E. Simpson, adjunct clinical professor of 

 dermatology; Charles P. Caldwell, adjunct 

 clinical professor of medicine; Edward L. 

 Moorhead, adjunct clinical professor of 

 surgery. 



DISCUSSION AND CORRESPONDENCE 



TESTS OF RADIATOR HUMIDIFIERS 



By request of physicians I have tested four 

 types of radiator humidifiers on the market 

 in Minneapolis. The experiments were per- 

 formed at my house, which is heated by hot 

 water. For the first three types mentioned 

 the tests were made at the same time on the 

 same radiator. The results are therefore 

 strictly comparable. The results for the 

 " Flobun " were obtained at a later date. All 

 results have been calculated to indicate evap- 

 oration, per twenty-four hours, for each hori- 

 zontal foot of radiator occupied by the appa- 

 ratiis. 



RESULTS 



"Speeo, " av. of 3 tests, zero weather, 



January, 1916 294 g. 



"Save," av. of 3 tests, zero weather, 



January, 1916 230 g. 



' ' Buddington, ' ' av. 3 tests, zero weather, 



January, 1916 1,116 g. 



' ' Elobun, ' ' av. of 2 tests, zero weather, 



December, 1916 1,248 g. 



These results for the " Buddington " and 

 " Flobun " were obtained using wicks which 



were new or nearly new. But the efficiency 

 of both instruments rapidly falls if tap water 

 is used, owing to clogging of the wicks. In 

 two days the loss of efficiency in one series of 

 experiments with the " Flobun " was 25 i)er 

 cent. 



Inasmuch as 10 to 30 gallons of water 

 (Bryce, of Ottawa, says 1:5 gallons) must be 

 evaporated daily in an ordinary-sized house to 

 maintain reasonable humidity under the con- 

 ditions of our northern winters, it will be seen 

 that these radiator devices are practically 

 worthless. Using the sling psychrometer I 

 was never able to detect an increase of humid- 

 ity from the use of any of them. Indeed, the 

 best of them is no more efficient as an air 

 moistener than one human being. The av- 

 erage evaporation from lungs and skin of a 

 large laboratory class in subzero weather, and 

 about 70° inside temperature, was nearly two 

 ounces per hour per person, or about 1,200 

 gTams a day. 



E. P. Lyon 



Universitt of Minnesota 



a new meteorite 



About 6:20 p.m., July 4, 1917, there fell 

 within the corporate limits of Colby, "Wis., in 

 the western part of the city, which is in the 

 county of Clark, an achondritic aerolite, the 

 fall of which was witnessed by a considerable 

 number of people. 



Unfortunately, knowledge of this fall did 

 not come to me until two weeks later and a 

 visit to the locality was made on July 24, at 

 which time the stones had become considerably 

 broken up and dispersed. 



Two pieces fell, the smaller about one half 

 mile ISTNE. from the other. The larger stone 

 fell in a pasture, striking a granite rock, at 

 least two inches in thickness, lying upon or 

 near the surface, breaking this rock into many 

 fragments and itself breaking into twenty-seven 

 or more pieces. The larger mass, weigh- 

 ing 22% pounds, penetrated the stiff Colby 

 clay to a depth of five feet. Some of the 

 smaller pieces are said to have distributed 

 themselves laterally in the soil to the extent 

 of about four feet. 



