( 228 ) 
of Linpg!), we will take 1.15 for the density of nitrous oxide 
after NATTERER 2). Hence we obtain 4.85 as the value of D for 
liquid nitrous oxide at its boiling point, while Linpe found 5.42 
for the same at 0° C. For gaseous nitrous oxide we obtain D = 5.103 
assuming d= 1.969 X 10% K == 1.001158 after KLEMENCcIc. 
With oxygen also only an approximate test of the formula is 
possible as the required data are inaccurate. More especially the value 
of the D.-C. of gaseous oxygen is unknown, and there exists only 
a well grounded supposition by Dewar and FLEMING *) that it will 
not differ sensibly from that of air, which was found by both 
BoLTZMANN and KLeMencic to be 1.00059 at 0° C. and 760 mm. 
The density of gaseous oxygen is 1.4292 X 10-3 at 0° C. and 
760 mm.‘), that of liquid oxygen is 1.124 after OLSZEWSKI ®), 
1.1375 after Dewar °) and 1.134 after LADENBURG and KRÜGEL 7). 
If we then assume 1.00059 for the D.C. of gaseous oxygen, and 
1.1375 for the density of the liquid we arrive at 1.556 as the D.-C. 
for the latter, which value agrees as far as the order of magnitude 
with the values found by Dewar and FLEminG. Conversely assuming 
the D.-C. of the liquid oxygen we obtain the value of 1.00051 for 
the gas instead of 1.00059. 
From the uncertainty of the data employed a better agreement 
cannot be expected. The experiments are at least not contrary to 
the Crausius-Mosorrr formula, while the further consideration of 
its application to oxygen must be deferred for the present. 
Physics. — “The Hatt-effect and the increase of Magnetic Re- 
sistance in Bismuth at very low Temperatures”. By Dr. 
E. VAN Everpincen Jr. (Communicated by Prof. H. Ka- 
MERLINGH ONNES). 
(Will be published in the Proceedings of the next mecting.) 
g. Ann. 62 p. 184. 
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*) Lanpour and BöRNsTEIN, p. 116. 
5) Ztschr. f. phys. Chem. XVI, 383. 
5) Proc. Royal Instit. 96. 
7) Ztschr. f. Compr. Gase 99 p. 77. 
io) 
(November 22, 1899.) 
