INTERNAL TEMPERATURE OF LEAVES. 



279 



In the third c/ass those species are to be placed which grow, 

 as a rule, only once or twice annually, e.g., Mangifera indica, 

 Cinnamomum zeylanicum, Mischodon zeylanicus. In these 

 cases the new growth is usually general over the whole tree. 

 These are the species in which this phenomenon of rapid growth 

 at restricted periods is seen at its fullest development. In 

 them the phenomenon is the most striking to the observer , as 

 the new shoots are usually most sharply marked off from the 

 old. The simultaneous covering of the whole tree with a 

 bright pink canopy, as in Mesua ferrea, or golden brown, 

 as in Mangifera indica, cannot fail to attract attention. We 

 can therefore get a little nearer to a true estimate of the 

 difference probably caused by difference of climate in the 

 different months by eliminating the first class, namely, those 

 which show some growth in all or almost all the months of the 

 year. The following species may be included in this class : — 



Aglaia Roxburghia.na. 



Saraca indica. 



Brownea grandiceps and 



other species of 



Brownea. 

 Anacardiuin occidentale. 

 Butj'rosperumum Parkii. 

 Turpinia pomifera. 



Duabanga moluccana. 

 Pometia exiiiiia. 

 Humboldtia laurifolia. 

 Eugenia caryophyllata. 

 Caraipa guineensis. 

 Connarus monocarpus. 

 Amherstia nobilis. 

 Anioora Rohituka. 



In all these the growth at one time is only partial and does 

 not involve the whole tree, and each of them recurs many times 

 in the records, in fact in some months the list consists chiefly 

 of these, e.g., November, 1906. 



Excluding these, we shall have left those species which more 

 fully illustrate the phenomenon of periodicity, and the monthly 

 results come out as follows : — 



In this table the dry month of February again stands out 

 with the largest number of growing species, the month of 

 December being next, though about it, as has been said, certain 

 reservations are to be made. July, in the height of the south- 

 west monsoon, when there was very little sunshine, and 



