471 



as appears froiri some remarks, was inclined to the belief iliat the 

 pressure effect might be referred to the phenomena of electrostric- 

 tion. On page 215 loe.cit. it says about this : ,,In meiner schon 

 erwahnten Arbeit iiber die Druckdifferenzen wurde gezeigt, dass 

 bei Argonröhren innerhalb eines gewissen Drnckgebietes (etwa 0,5 

 bis 3 mm. Hg) die sich bei einer gegebenen Stromsttirke einstellende 

 Druckdifferenz zvvisefien den Enden der 600 mm. langen, 0,8 cm. 

 weiteii Röhre nmgekehrt proportional dem in der Rohre herrschenden 

 Druck war. Dnrch einen Irrtnm wurde diese Heziehung fur alle 

 Edelgasse als guitig angenommen und daranf eine Theorie, der Er- 

 scheinnng gegrimdet. Diese kann wohl nicht richtig sein, da die 

 Beziehung nur fur Argon in dem genannten Druckgebiet erfiillt ist, 

 aber nicht z. B. fur Neon oder Helium." 



We point out, however, that A. Rüttenaüer does not only find 

 the dependence on p for argon, but also for the noble gases neon 

 and helium, so that here no argument is present to induce us to 

 look for the central point of the explanation of the phenomena in 

 another region. We also remarked before that already in 1880 D. 

 Bos ^) showed that the effects wliich can ensue from the electro- 

 striction for gases, are exceedingly small. 



Besides, as we could show that the region covered by A. 

 RfJTTENAUER quantitatively continued that examined by us, if only 

 the right laws of diffusion are applied for every region, the validity 

 of our theoretical conception is confirmed for investigations in which 



TABLE B. 



is^plp as 1.3 to 50 or ca. 1 to 40 



Q 0.03 to 2 or ca. 1 to 70 



p 0.15 to 1.2 or ca. 1 to 8 



A 66 to 12.7 or ca. 1 to 20 



g 0.6 to 45 or ca. 1 to 75 2) 



M 4 to 40 or ca. 1 to 10 



/ 5 to 60 or ca. 1 to 12 



^) Diss. Groningen. 



2) That for the tension gradient in tliis record of tlie ratios also observations 

 made on nitrogen, are included, may be justified thus. We published the following 

 measurements already before: Pi = 1.18 m.m. Hg. Terminal voltage 288 V. 

 /, = 6.5 cm. gi = 3.15 m.m.^. M^ = 28, A^ = 12.7 Amp. c.m.2, p^ = 0.18 mm. 

 Pz = 0.15, /g = 5, q.2 = 8.15, Mc, = 28, Ac, = 12 7. For nitrogen in uviol glass with 

 Q = 3.15 m.m.' there are known to the author (Tabel C) the following three obser- 

 vations of p in connection with the terminal voltage, from which we arrive at the 

 bracketed values for the potential difference between the ends of the positive pile 



