1014 



SCIENCE. 



[N. S. Vol. XV. No. 391. 



Excited Radio-activity from the Atmos- 

 phere: Mr. S. J. Allan. 

 The amount of the radio-activity is in- 

 dependent of the material of the nega- 

 tively electrified wire. After exposure, 

 the intensity of the radiation fell to one 

 half in fifty minutes; while that excited 

 by thorium fell to one half in eleven 

 hours. 



Radio-activity Induced in Salts by Cathode 

 Rays and hy the Discharge Bays from 

 an Electric Spark: Mr. W. R. Cabr. 

 Experiments carried out under the di- 

 rection of Dr. J. C. McLennan. Radio- 

 activity is excited in certain salts by Ront- 

 gen rays, as well as by cathode rays, and 

 by the discharge rays from an electric 

 spark. 



Radio-activity Induced in Substances Ex- 

 posed to the Action of Atmospheric Air: 

 Mr. R. M. Stewart. 



Experiments carried out binder the di- 

 rection of Dr. J. C. McLennan. The rate 

 of loss of induced radio-activity depends 

 on the potential at which the wire was ex- 

 posed, rather than on the time of exposure. 



On the Absolute Value of the Mechanical 

 Equivalent of Heat: Professor H. T. 

 Barnes. 



The heat required to raise the tempera- 

 ture of one gram of water from 15.5° 

 to 16.5° C. is equal to 4.1832X10' ergs. 

 In gravitation units this becomes 426.60 

 kilogrammeters, or 777.58 foot-pounds. 



On the Density of Ice: Professor H. T. 



Barnes and Mr. H. L. Cooke. 



Historical resume and criticism. New 

 experiments. Probable cause of variation 

 in density. Bibliography. 



The Variation in the Density of Ice: Mr. 



H. L. Cooke. 



The variation is ascribed to mechanical 

 strains due to imequal expansion and con- 

 traction. 



The Fall of Potential Method as Applied 

 to the Measurement of the Resistance of 

 an Electrolyte in Motion: Professor H. 

 T. Barnes and Mr. J. G. W. Johnson. 

 Measurements of the conductivity of 

 solutions of mag-nesium chloride. During 

 the measurements the solution flowed slow- 

 ly through the cell; the velocity of flow 

 did not affect the results. 



chemistry. 

 A Modification of Victor Meyer's Vapor 



Density Apparatus: Professor B. J. 



Harrington. 



The long stem is bent into a series of 

 loops, and a second opening is provided for 

 introducing the substance into the bulb. 

 The apparatus is compact and convenient. 



071 the Determination of Moisture in 



Boney: Mr. F. T. Shutt. 



The honey is dried in a current of air 

 at a constant temperature below 100° C, 

 and the loss determined. 



An Improved Method of Producing Con- 

 centrated Manure from Human, Refuse: 

 Mr. T. Macfarlane. 

 Description of an odorless moss-closet. 

 When properly used, the quantity of ab- 

 sorbent is not more than one twentieth of 

 the resulting manure. 



Experimental Investigatio7i of the Condi- 

 tions Determining the Oxidation of Fer- 

 rous Chloride: Mr. A. McGill. 

 Ferrous chloride can be decomposed by 

 oxygen in such a way as to yield uniform- 

 ly from 75 to 85 per cent, of its chlorine 

 in available form, and from 10 to 20 per 

 cent, as hydrochloric acid. 



Analysis of Anthraxolite from Hudson's 

 Bay: Professor W. H. Ellis. 

 A sample brought by Mr. G. R. Miekle 

 from Long Island, Hudson's Bay, con- 

 tained 0.54 per cent. ash. The dry ash- 

 free mineral gave: carbon, 96.54; hydro- 

 gen, 1.33. 



