IN CEYLON. 
433 
am indebted to Dr. Treub for the information in the following 
synopsis of the monthly rainfall, humidity, and temperature 
at Pasœrœan in East Java and Buitenzorg. 
Climate during 1904 in Java. 
Rainfall in mm. 
Monthly Average 
mean humidity. 
Monthly Average 
Mean Shade 
Temperature in °C. 
Buiten¬ 
zorg 
East 
Java. 
Buiten¬ 
zorg. 
East 
Java. 
Buiten¬ 
zorg. 
East 
Java. 
January 
417 
221 
83 
77 
24-0 
27-2 
February ... 
455 
192 
85 
80 
23-6 
26-9 
March 
169 
287 
80 
80 
24-5 
26*6 
April 
204 
33 
79 
76 
25-0 
27-4 
May 
541 
155 
80 
76 
25-3 
27*3 
June 
389 
27 
78 
73 
251 
27-1 
July 
312 
48 
79 
71 
24-8 
26*7 
August 
344 
18 
75 
67 
25-1 
27*1 
September... 
388 
— 
76 
64 
25*3 
27*7 
October 
799 
11 
81 
64 
24-9 
28*7 
November ... 
312 
24 
80 
67 
25-2 
28*7 
December ... 
Average 
mean, yearly 
498 
110 
85 
74 
24*2 
27-9 
1901—1904 
4,416 
1,200 
79 
71*9 
25-0 
27-6 
4.—The Leafless Phase in the Tropics. 
In studying this part of the subject we find that plants of 
the same species may show variation in different climates, 
and in the same neighbourhood, and in several cases even 
the same tree exhibits differences in foliar periodicities 
from year to year. 
The facts recorded in this section lead to certain conclu- 
sions which form the stepping stones for subsequent 
deductions of some importance. They prove first and 
foremost that under tropical conditions with regular rainfall, 
heat, and light, and in the absence or presence of climatic 
periodicities certain plants undergo defoliation at a particular 
time of the year. They prove that in a tropical district 
supplied with rain during every month of the year— 
