Liquefaction of Gases* 211 



arid confirmation of these researches, most of which were pub- 

 lished several years before his corresponding investigations. 

 His work is really original only as to the magnetic properties 

 of liquid oxygen : that which is not borrowed from my 

 researches is a development of ideas struck out by another — 

 as, for instance, the experiments on electrical resistance at 

 low temperatures, which were begun by Clausius, continued 

 by Cailletet and Bouty, and brought ten years ago by my 

 former fellow-worker, the late Prof. Wroblewski *, to the 

 temperature of the freezing-point of nitrogen, then several 

 degrees below the temperature attained in the experiments of 

 Messrs. Dewar and Fleming, who, it is true, extended their 

 examination to various metals, alloys, and non-metals. But 

 the execution of these labours meets with no difficulty; for 

 the method of getting large quantities of liquefied gases is 

 now generally known. 



In the table opposite (p. 210) I have set down the most im- 

 portant numbers, obtained as stated in my former experiments, 

 concerning the liquefaction and solidification of gases. 



List of my Researches, of ivhich I have specified the most 

 important Results in the foregoing Summary. 



All my researches were at first published in the Polish 

 language, in the publications of the Cracow Academy of 

 Sciences ; I afterwards published an excerpt of each of them 

 in French and German. The present list contains only 

 French and German papers, as being accessible to students of 

 every nationality. The numbers enclosed in brackets in the 

 preceding summary have reference to the ordinal numbers of 

 the following list. 



1. K. Olszewski. Essais de liquefaction de l'hydrogene. — Gomptes 

 Bendus, vol. xcviii. p. 365 (1884). 



2. . Nouveaux essais de liquefaction de l'hydrogene, solidifi- 

 cation et pression critique de l'azote. — 0. R. vol. xcviii. 

 p. 913. 



3. . Temperature et pression critique de l'azote. Tempera- 

 ture d'ebullition de l'azote et de l'ethylene sous de faibles 

 pressions. — G. R. vol. xcix. p. 133 (1884). 



4. . Temperature et pression critique del'air. Relation eritre 



la temperature de Fair et la pression de l'evaporation. — 

 G. R. vol. xcix. p. 184 (1884). 



5. . Relation entre les temperatures et les pressions du 



protoxyde de carbone liquide. — G. R. vol. xcix. p. "706 

 (1884). 



* Comptes RenduSy ci. p. 161. 

 P2 



