Chemistry and Physics. 401 



der over a range of to S9 cm of mercury. The quantity, moreover, 

 wa? not altered if the exterior pressure on the iron cylinder was 

 varied from one to a half atmosphere. The pressure, therefore, 

 under which the gas is driven through the iron is of a different 

 nature from that which one might suppose and has an under 

 limit of 58 atmospheres. 



(2) The diffusion with constant current strength increases nota- 

 bly with the temperature; and if one puts the diffusion propor- 

 tional to a power of the absolute temperature, this power is at 

 least equal to 5. 



(3) The diffusion increases at constant temperature with increas- 

 ing current strength but not in a proportionate manner. 



(4) From 1 aud 3 one can understand the observations of Nernst 

 which show that the pressure of the ions formed electrolytically 

 can be very great and that this pressure depends upon the poten- 

 tial difference under which the electrolysis occurs. In view of 

 this great pressure which drives the ions through the metal, one 

 can understand the no effect on one to a half atmosphere mentioned 

 in 1 : also one does not wonder at the results of Bellanti and 

 Lussana, who found that diffusion occurred even against a pres- 

 sure of 20 atmospheres. 



(5) At constant temperature and similar conditions of solutions 

 and electrodes the quantity of diffusion was nearly proportional 

 to the potential difference. — Ann. der Physik, No. 9, 1905, pp. 

 589-626. j. t. 



11. -Landolt-Boi'/istein Physikalisch-chemische Tabellen. Dritte 

 umgearbeitete and vermehrte Auflage, herausgegeben von Dr. 

 Richabd Bornsteix mid Dr. Wilhedi Meterhoffee. 861 pp. 

 Berlin, 1905 (Julius Springer). — The first edition of this very 

 important work was published in 1883 and the second in 1894. 

 The decade that has passed since the latter date has seen a very 

 high degree of activity in physical research and a corresponding 

 increase in the amount of physical data. In the working over 

 aud arrangement of this large amount of material, the editors 

 have had the support of upwards of forty associates, chiefly in 

 Germany : the work has been carried through with the support 

 of the Prussian Academy of Sciences. The volume opens with 

 the international atomic weights of 1903 calculated with oxygen 

 = 16. Then follow tables of latitude and longitude of important 

 places and then the tables of physical data relating to volume, 

 density, elasticity, tension, etc. ; then those pertaining to heat, 

 light, elasticity, magnetism and sound. The name of the worker 

 who has elaborated each series of tables is given at the bottom 

 of each page and following each subject are the references to the 

 literature giving fully the authorities quoted. The comprehen- 

 sive scope, thoroughness and accuracy of this great work give it 

 a unique place in physical literature and make it essential to 

 every laboratorv. 



