PHYSIOLOGICAL RESEARCH IN THE TROPICS. 
BY 
ALFRED J. EWART, D.Sc.; Pu. D.; F.L.S. 
During my stay at the Buitenzorg gardens the two researches 
on which I was engaged occupied my time so fully that a 
variety of other problems in which I was interested were 
perforce neglected, and even the researches ') actually completed 
and published leave untouched several points on which further 
Tesearch is eminently desirable. It seems to me therefore that 
. could not do better than occupy the limited space at my 
tisposal_ by describing what these problems are and how their 
“dlution may be attempted, and perhaps it may be adviseable 
0 mention first of all the different paths branching out from 
two published papers mentioned, along which further and 
"uitfal lines of research might be developed. 
With regard to the effects produced by tropical insolation, 
itis evident that the resistant powers of different plants may 
"ary within wide limits, for the chloroplastids of one plant 
tg be almost entirely bleached by an exposure to sunlight 
Produces hardly any perceptible effect upon those © 
of &. A series of simple biological investigations would ° 
the utmost interest and importance in this connection, without 
2 ing necessary to determine directly the effects produced 
Ee the assimilatory activity of the leaves. It would be suf- 
oo 
1897, p. 489—480; 
ty, 
IL i: . the Effects of Tropical Insolation, Annals of Botany, ee 
rT eee Irritability. Ann. d. Jard. Bot. d. Buitenzorg- . 
