Annexe B 
Rapport sur le Laboratoire Central a Christiania 
Report of the Central-Laboratory, July 22nd 1905—July 21st 1906 
I. Supply of Apparatus: 
The assistance of the C. L. in procuring oceanographic apparatus for the 
expeditions, has been employed to an undiminished extent during the year. 
II. Control Analysis of Water-Samples: 
It was decided at the sitting of the International Council in Amsterdam Fe- 
bruary 1906, that no great importance should be attached to the performance of 
control analyses, and that it should not be regarded as compulsory to send 
samples to the C.L. for this purpose. Since this time no such samples have been 
received at the C. L. 
Ill. Preparation of Standard Water: 
Two sets of standard water have been prepared, on Sept. 2 1905 and on 
June 30 1906. In analysing them, the Primary Standard prepared in Dec. 1903 
was used for the first time. This water has been denoted shortly by the letter P; 
and the two supplies of standard-water mentioned above have likewise been de- 
signated P, and P,. In the actual analysis of P and P, in Oct. 1905 two tubes 
of each (44, 108 of P, and 18, 264 of P,) were compared with Knunsen’s VI, 
of which some tubes had been set aside for this purpose. The results obtained 
on the basis of Knunsen’s VI Cl°/oo 19.3800, were for Knunsen’s VI, 19.3803, 19.3797, 
and for P, 19.4476, 19.4486, 19.4483 Mean 19.4482; for P, (Mean of three) Cl = 
19.3868. P, was then labelled and issued with the value Cl= 19.387. P, was 
compared in July 1906 with P, and the value found to be 19.3754 which was 
rounded up to 19.375. This value has been printed on the labels issued with P,. 
IV. Determination of the Compressibility of Sea-Water: 
The experimental work for this purpose has been completed after the ori- 
ginal programme, somewhat reduced. The compressibility of sea water of three 
