( 744 ) 



^ 2. The restoration of our former value 0.0036627 further 

 involves the following modifications, which are all of no importance 

 as thev do not exceed the errors of observation, but should be applied 

 to make the agreement in the calculations complete : 



1. that in table XVI of Comm. N'. 97* (Jan. '07) in the first 

 column the values of table XII are restored, and so all the numbers 

 in the last decimal are increased by a unit. The latter holds also 

 for the values of the second column of table XVI, 



2. that in table XVII of the same Communication the values of 

 the tirst column, except the last two, are increased by a nnit in the 

 last decimal, 



3. that no further corrections are required for the temperatures in 

 table XVI of Comm. N". 99« (June '07) and table XX of Comm. 

 N". 100" (Dec. '07) (see conclusion of § 14 of Comm. N". 99'» and 

 of § J 8 of Comm. N". 100«). 



4. that in § 3 of Comm. N". 100'' (Dec. '07 j the value for ^wjioo^.o 

 and the corresponding virial coeflicients are subjected to small changes, 

 which, however, are of no importance, 



5. that the last line of Comm. N". 10I« (Dec. '07) must be left out, 



6. that in § I of Comm. N°. 101^ (Dec. '07) «jf= 0,0036619 

 changes into 0,0036617, and 7u«c. = 273^08 into 273MO, while 

 7ooc. = 273°. 07 of note ^) in the § mentioned changes into Tqoc. = 

 273°.09 and that in §2 it =— 273°.08 C. becomes — 273°.10C., the 

 changes in B\g„ and in the values of table XXV being imperceptible, 



7. that the numerical values in §§1 and 3 of Comm. N". 102^ (Dec. 

 '07) require the emendations which have been applied in the trans- 

 lation in the Proceedings (Febr. 29 '08) (See footnote 1 there). 



Physics. — "On the condensation of helium.'" By Prof. H. Kamek- 

 LiNGH Onnes. Communication N". 105 of the Physical Laboratory 

 at Leiden. 



(Not communicated here, see next communication). 



Physics. — ''Experiments on the condensation of helium by expan- 

 sion" By Prof. H. Kamerlingh Onnes. Communication N". .105 

 of the Physical Laboratory at Leiden. 



In the last session I communicated what I had observed in expand- 

 ing helium, which at a temperature of ^ 259° C. had been strongly 

 compressed. I made the experiment in consequence of my determina- 

 tions of the isotherms of helium at different temperatures i. a. also 



