286 TK Spring — Compression of Powdered Solids. 



values, but according to the experiments of this article the 

 transverse current continues to increase throughout. (Ettings- 

 hausen and Nernst state that in their experiments with bismuth 

 the transverse current actually declined in value when the 

 magnetizing field was made very strong.) 



Strong magnetization of bismuth in one direction produces 

 a much greater transverse current than equally strong magne- 

 tization in the opposite direction. (This dissymmetry is noted 

 by Ettingshausen and Nernst ) 



A slight permanent rotation of the equipotential lines in 

 cobalt is produced by magnetization, the direction of the effect 

 being the same as that of the temporary effect. Nickel and 

 bismuth were tested hastily in vain for a similar permanent 

 effect. 



The cobalt used in the experiments of this article has an 

 R. P. about tt-J times as great as that of the specimen previ- 

 ously used, and its K. P. is relatively much less affected by 

 change of temperature. 



Erratum : The sign — should be placed before the R. P. of silver in the August 

 number of this Journal. 



Art. XXXI. — The Compression of Powdered Solids : A 

 Note by W. Spring. 



Mr. Hallock, in a note inserted in this Journal,* has been 

 good enough to recognize that his article entitled " The Flow 

 of Solids " had through oversight been worded in such a way 

 as to attribute to me the exact opposite of the conclusions I 

 had drawn from my researches. In effect, whereas my ex- 

 periments were made in view of determining whether certain 

 characteristic properties of the liquid state, such as the faculty 

 of welding together, etc., existed to a more or less minimized ex- 

 tent in solid bodies ; Mr. Hallock, on the contrary, thought that 

 the manifestation of these properties required previous lique- 

 faction, so that I should have been wrong in assigning to the 

 solid state some of the characteristic properties of liquids. The 

 experiments he has made to verify this point have shown him 

 that matter does really remain solid under strong compres- 

 sion, unless the bodies experimented with occupy, as is the case 

 with ice, a smaller volume in the liquid than in the solid state. 

 But in the latter part of his note Mr. Hallock again takes up 

 the interpretation of my results and objects that the majority 

 of the phenomena mentioned by me are not due to cubic com* 

 pression, but rather to kneading under pressure. 



* Vol. xxx vi. p. 59 



