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13 
five days spent in coming up. Our return 
route therefore followed the S.W. ridge, 
leaving the spur by which we had ap- 
proached it from the Momi to the right. 
Continuing due north we gradually de- 
scended to about 5000’, then bearing east 
along a lateral spur which finally dipped 
very steeply to the rocky bed of a tribu- 
tary of the Momi. After crossing the 
latter, we emerged on to the north bank 
of the Momi River, where we bivouacked 
for that night, returning to Wariap the 
next day. 
The chief difficulty of this somewhat 
strenuous route is the want of water, 
there being none between the vicinity of 
the lakes and the tributary of the Momi. 
According to fig. 2 this route would 
follow the “ Bonyas Gebebergte,” which 
join the spurs of the Arfak indicated on 
the sketch-map to the north of the sup- 
positional position of the Ransiki River. 
The altitudes in the sketch- map, 
judging by the character of the vege- 
tation, seem somewhat underestimated. 
2. METEOROLOGY. 
The following facts referring to the 
north-west coast are taken from Braak’s 
(24, 210) paper on the climate of New 
Guinea, which summurizes all the infor- 
mation at present available. 
On the north coast the east or dry 
monsun prevails from May and June to 
September and October, though even 
then much rain may fall. In Mano- 
koeari the east monsun is the driest time 
(24, 219). It is probable that in the 
interior the difference between the cha- 
racter of the E. and W. monsun is much 
less pronounced. 
In N. New Guinea it is at present 
not possible to give actual figures, though 
