14 
it may be accepted that the temperature throughout the whole year is very 
constant, and that the mean variation is probably between 26° and 27° C. 
(24, 223). 
Braak’s table (24, 221) quotes the average rainfall for several years for 
Sorong, Manokoeari, Djendé on Roon Island, and Windesi to the south 
of Geelvink Bay. In both the latter stations the rainfall is much higher 
than on the more exposed N. coast at Sorong and Manokoeari. 
In the historical summary the prevailing weather has been quoted 
whenever recorded, and it will be seen to vary considerably. At Mano- 
koeari, January and June were considered the wettest months. During 
a stay there in November 1913 the weather was very fine; jbut on my 
return in December the rainy season had set in and there was rain every 
day, generally in the afternoon, the temperature being markedly cooler. 
In the intervening period, spent at Warén and Wariap, on the coast of 
Geelvink Bay, in the Arfak, and on returning to Manokoeari along the 
coast, only three half-days of rain were experienced, and these occurred on 
the way up and while at the lakes, where the rain was also accompanied 
by strong wind. Otherwise the fine still weather was a constant source of 
amazement to the Papuans, the rainy season being well overdue, and they 
attributed this lucky chance to the fact that sometimes at the oe of the 
monsun a short halcyon period of fine weather sets in. 
At Warén and Wariap a very strong N.W. breeze scsiieintily sprang up 
between 3 and 4 P.M., causing a sudden fall of temperature. 
Unfortunately my only available calendar was lost at Warén. Con- 
sequently, no readings were taken either there or at Wariap, and only one or 
two in the mountains, which were as follows :— 
On the Momi River, 3500’. 75° F. 6p.m. 
On the crest of the 8.W. ridge, 8500’. 68°F. 4 p.m. 
On the “Woman” lake, 7000’. 60° F. 7 A.m.; and on the following 
day at the same hour, 55° F. 
Up at the lakes it was always cool in the early morning, the sun being 
very hot in the middle of the day, but cooling down in the afternoon and at 
night, though warmer than at the same altitude on Kinabalu. Both Pratt 
and Gjellerup reported very wet weather during their several stays at the 
lakes. 
3. PHYTOGEOGRAPHY. : 
The general plant-formations, as is shown below, agree in broad dutline 
with the topographical zones already described. They are :— 
(a) Beach Formation : Immediate Shore-Line. 
(6) Inundation Forest Belt : “ Korang ” or Coral-Limestone Zone, 
