582 



SCIENCE 



[N. S. Vol. LIV. No. 1406. 



ing some relation between the acidity of the 

 soil and adsorption. This work is giving 

 most interesting results. 



Many of these results speak for themselves, 

 but a discussion together with a full report 

 of all results is being published elsewhere. 

 Neil E. Gordon, 

 E. C. Wiley, 

 E. B. Starky, 

 A. L. Flenner, 



D. 0. LiCHTENWALNER 



TJniversitt or Maryland 



THE AMERICAN CHEMICAL SOCIETY. 



(Cmitinued) 

 Luminescence of parabroinophenyl magnesium 

 Iromide and related compounds: W. V. .Evans 



AND K. T. EUPFORD. 



A simplified titrating hydrogen electrode and 

 its use in a plant laboratory: Felix A. Elliott. 

 The hydrogen electrode previously described by 

 the author has been modified for use in titra- 

 tions. It has been possible to meet the three im- 

 portant conditions of (1) working in a hydrogen 

 atmosphere, (2) efficient and quick mixture of 

 the solution being titrated with the acid, alkali or 

 other solution, and (3) eliminating the contact 

 potential and at the same time maintaining a 

 constant volume of the solution under investiga- 

 tion, without undue complications in the design 

 and without mechanical agitation. The internal 

 resistance of the cell has been kept very low, thus 

 insuring ample sensibility with the more rugged 

 types of measuring instruments. The apparatus is 

 portable. When fitted with platinized platinum 

 electrodes this cell may be used to determine the 

 content of lime and magnesia in limestone, the 

 amount of acid or alkali in various plant liquors, 

 examples being given. With bright platinum elec- 

 trodes the cell may be used for such titrations as I 

 with sodium thiosulphate, Fe with sodium diehro- 

 mate and other titrations involving similar reac- 

 tions with a change in the charge on one of the 

 ionic species in solutions. 



High frequency ozone production: F. O. An- 

 DEEEGG. To eliminate the dielectric, which is the 

 greatest weakness with commercial ozonizers, ad- 

 vantage was taken of the fact that it is im- 

 possible to maintain a high frequency arc. An 

 aluminium tube 5 x 190 cm. with a concentric 

 wire was used for the discharge. Current was 

 supplied up to half an ampere and 7000 volts at 



about a million and a half cycles frequency by a 

 small Tesla coil which was designed so as to give 

 the best discharge with the tube used. The high- 

 est yields were secured with a rather large wire 

 provided with numerous small points so that the 

 discharge should be made up of many brushes. 

 The ozonized air contained but small a', .lounts of 

 nitrous oxides although on raising the voltage 

 tiU the discharge was filled with sparks' about 

 0.02 per cent, was obtained. Numerous curves 

 have been worked out showing the relationships 

 between the different variables which are usu- 

 ally similar to those obtained in low frequency 

 ozone production. Maximum concentration was 

 15 gram per cubic meter. The greatest efficiency 

 obtained was 17 gram per kilowatt hour which in 

 view of the wasteful method of producing the 

 high frequency current is encouraging. 



The reaction between tungsten and hydrocar- 

 bon vapors: Saul Dushman. 



The activity of ions in mixed electrolytes: C. E. 

 EuBY, T. W. Bakteam and Y. L. Yeh. The 

 electromotive-force of cells of the type H, (1 

 atm.), HCl (Co) -f MCI (c,), AgCl, Ag were meas- 

 ured, in which MCI was, in the two sets of ex- 

 periments, KCl and NaCl respectively, and the 

 sum of the weight-normal concentrations (o, + Cj), 

 was held constant in each set of measurements, Ci 

 being varied ten-thousand-fold. Four sets of meas- 

 urements were made, employing the values of .2, 

 and 1.0 weight-normal for the sum of e, and Cj. 

 The results obtained in these experiments are in- 

 terpreted in the light of the theory of inde- 

 pendent ion-activity. 



The atomic structure: Upon the subtlety of di- 

 rected particle motion hang all the properties of 

 matter: H. K. Kipper. By our theory we postulate 

 that : Light is a wave motion of the particles of the 

 ether. Electricity is a helical or screw motion of 

 the particles of the ether (whether atomic or unor- 

 ganized). Magnetism is a compensated helical or 

 screw motion of particles. Gravity is a fimction of 

 rotatory motion. Chemical affinity or valency is 

 based on the forces derived from the specific groups 

 of electrons. Solution affinity is based on the forces 

 derived from all groups — that is, such forces taken 

 as a field. All atomic forces are mechanically or 

 mathematically derivable and interpretable from 

 motions of particles in themselves representing 

 simply energy and matter. 



The cryosoopy of boron trifluoride solutions: VI: 

 System with methyl chloride: Albert F. O. Gee- 

 mann and Maeion Cleaveland. p. F. G. Boullay 



