( 290 ) 



wlicre Q?t i'^ tl'f njiInc of tlio fiiiiclioii '1^ of' the rcdnced tcnipci-aturc 



293.04 

 beloiiüinu' to t = 77. • 



II. 



For 03 we lunc \\>(h\ a rmiclioii ot' a toriii (liHoi-iiii:' sliulitlv tVcmi 



llic form M.J, ,iiiv(Mi in Snppl. X". <S, wliicli did nol only agree witli 



livdrogcn, owgen and nilrogen luil also w illi ellier. \iz. a form \ I. 2, 



which iiisteatl of agreeing with ether iii the same way as \ I. 1, 



agrees with the average of etiier and isopeiitane : 



1 1 



10'' . 33 = -I- 179,883 r - 874.487 — 181.324 — 11 0.2(17 - 

 ' t (3 



The agreement appears from tlie foUowing table, wiiere we (ind 



in the first colnmn the \ alnes ealeulated aeeordiiig to tiie last formnla, 



and in the second column those of the quadratic formnla of § 3; 



according to according to difference 



corresponding states (piadi'atic formula 



— 0.020772 _ 0.001148 



— 0.0158(iii _().()( )()(;;}(; 



— 0.011855 _().()()()324 



— 0.006515 _|_ 0.000030 



The deviations on the side of the methyl chloride are larger than 

 those of the errors of observation and those of the (piadratic formula. 

 Methvl chloride, therefore, does not agree so well with ethei- and 

 isopentane as carbon dioxide. This same result is also arrived at in 

 another way. It ap|)ears, however, that the mixtures do not deviate 

 more than the melhyl chloride itself. 



( To hi' continued). 



Physics. — "Oil tin' nWKsiirenh'nt of iwn/ loir temperatures. VII. 

 Coinimi-i^on of the /iln/iinrni tliermometer ii'ifji flic hiidcogcn 

 thennouictcr' . (Continuation of Conim. X". 77. Febr. 1902). \ix 

 B. Meilink. Communication X". 93 from the Physical Labo- 

 ratory at Leiden by Prof. Fl. Kamerlingh ()nnes. 



(Commuiiicalcd in the meeting of June 25, 1904). 



§ 5. The mm.mvcmcnt.^ at low teini>crature.^. The thermometers 

 were mounted as described by Kamerlingh Onnes in Conim. N". 83 

 Yehv. 1903 § 5. During the first i)reliminary measurements, the hydrogen 

 thermometer and the resistance thermometer (cf. Ccunm. X". 77 § 2) 

 were placed in the cryostat (described in Comm. X". 51, Sept. 1899), 



