1065 
are much greater than is generally accepted, also as to-the nitrogen, 
although in a less degree. When comparing the accumulation of the 
elements it thus seems, that during the metabolism this aceumula- 
tion is greatest for those, which form a small permanent percentage 
of the constituents of the organism. So we see, that in the course 
of an experiment the same quantity of an element may be many 
dimes active in the metabolism, one cell taking up the products 
excreted by another cell. 
Starting from this view the study of elements, such as manganese, 
which are already active in very dilute solutions, are interesting. 
Meteorology. — “A lony range weather forecast for the East- 
monsoon in Java.” By Dr. C. Braak. (Communicated by 
Dr. J. P. vaN DER Stok.) 
(Communicated in the meeting of November 30, 1912). 
In a preceding communication *) it was deduced from a study of 
factors of correlation that in the Indian Archipelago, with the excep- 
tion of the western part north of the equator, a connection is 
clearly perceptible between barometric pressure and rainfall. The 
nature of this connection appeared to depend upon the geographical 
position as well as upon the different seasons. 
In the following an attempt will be made to show that by means 
of this connection it is possible to make a long range weather forecast. 
For this purpose Java has been chosen, because a forecast is of 
greater value for this island than for any other part of the Archi- 
pelago on account of its intense cultivation. Moreover this research 
will be limited to the east monsoon, as the connection is less distinet 
in the west monsoon, and because a forecast for this season of 
abundant rainfall is of secondary importance. 
It will be necessary to prove, that the changes of the barometer- 
readings from year to year succeed each other according to definite rules, 
so that they may be determined in advance. Further we must also 
prove that it is possible to ascertain with sufficient accuracy how 
the rainfall depends upon the barometric deviations. 
With regard to the deviations of airpressure Java has an advan- 
tage over any other part of the world, because the variations of 
climate are determined by the variations of the barometric pressure 
in North Australia, which are characterised by an extraordinary 
regularity. No station outside North Australia can vie with it in 
this respect, not even Bombay of Cordova (Argentina) which stations 
1) These Proceedings 1912 p. 454. : 
