1068 
is changing exactly in the direction indicated by the scheme, so that 
there is every reason to believe that the next minimum will appear 
at the expected time (namely about the 1's of January 1913), while 
there is no indication in the course of the sunspot number that points 
to an early disturbance. Therefore also the appearance of the next 
barometric maximum about the 1*t of January 1915 is rather certain. 
From this already now may be concluded, with certain reservations 
that must be admitted with every forecast, that most probably the 
Kustmonsoon “in Java of 1913 will deviate in the wet, and that of 
1914 probably in the dry direction. 
Finally a remark may be made abont the barometercurve itself. 
In the preceding communication the question was raised as to 
whether the barometerperiod of 3.5 years has a terrestrial or an 
extraterrestrial cause; as for the Port Darwin curve, (and to this 
one a considerable weight should be attached, because it is not 
only the most regular one, but it has also the greatest amplitude), 
I should like to call attention to the fact, that the epoch of the 
maxina and minima seems to be entirely controlled by the 
terrestrial seasons. This seems to me a new proof for its terrestrial 
origin. The cosmical influences instead of causing the barometric 
oscillations, seem to disturb them (namely during the sunspot maximum). 
If the variations of climate (departures of-airpressure, tempera- 
ture and rainfall) of short period (BRÜCKNER’s period and the longer 
ones excepted) are described as a combination of waves of terrestrial 
origin with a period of about 3 years, and a cosmical disturb- 
anee, which is acting during the sunspot maximum, it seems to me 
that a satisfactory explanation may be given of the influence, that 
(as a result of different researches) is attributed to the sunspots. By 
a combination such as described above the fact may be especially 
explained, that although in many cases a connection is found, it 
manifests itself at different epochs in a different way, as e.g. KOpPEN 
has established for the temperature in the tropics. 
The idea here given about the origin of barometric variation of 
3 years is contrary, it is true, to the opinion of Lockyrr and Bicr- 
Low, whose ideas are that it is controlled by the number of 
prominences. However the data on which this opinion is based are by 
no means convincing as a comparison between curves | and II 
may teach. In curve III we have put down the observations 
made at Rome and Catania about the number of prominences, 
which data have also been used by the two above mentioned in- 
vestigators. Again the 6 monthly means of departure have been 
represented monthly in such a manner however that, following the 
