IX, A, 6 



Broion and Mathews: Dipterocarp Forests 



527 



of Livingston and Livingston to the southern end of Florida, the 

 portion of the United States showing the highest temperature 

 efficiency. The efficiency for Mount Maquiling is roughly twice 

 that of Virginia, Kentucky, and Tennessee in the central hard- 

 wood region, from which were obtained the growth measure- 

 ments of white oak and yellow poplar, which we have used for 

 comparison with those of the dipterocarps. 



This comparison of temperature efficiencies in the United 

 States and in the forest of Mount Maquiling is, of course, by 

 no means accurate. Livingston and Livingston do not assume 

 that the equation on which these results are based is final; 

 besides this, in any exact comparison we would have to take into 

 consideration the daily range of temperature and the differences 

 in the reactions of tropical and temperate zone plants. 



Table XLIII. — Temperature in forest of Mount Maquiling , Laguna 



Province, Luzon. 



[Degrees Centigrade.] 



Period. 



Undergrowth, 

 average of weekly- 



Second story, aver- 

 age of weekly- 



Dominant tree, 

 average of weekly— 



Maxima. 



Minima. 



Maxima. 



Minima. 



Maxima. 



Minima. 



Jan. 3 to Jan. 31 -.- . 



23.8 

 25.0 

 26.8 

 27.4 

 27.5 

 29.0 

 27.3 

 26.6 

 26.6 

 26.9 

 25.6 

 24.5 

 24.1 



20.0 

 19.3 

 20.0 

 20.5 

 21.1 

 21.9 

 21.4 

 21.4 

 21.2 

 21.1 

 20.7 

 20.0 

 20.0 



25.1 

 26.9 

 27.9 

 27.0 

 27.1 

 28.7 

 26.8 

 25.0 

 26.7 

 27.5 

 26.5 

 24.9 

 24.6 



19.5 

 19.1 

 19.4 

 21.2 

 21.7 

 22.7 

 22.0 

 22.2 

 21.1 

 21.9 

 20.9 

 19.7 

 20.7 



30.9 

 31.9 

 37.2 

 32.6 

 32.6 

 33.1 

 33.9 

 30.0 

 30.9 

 34.6 

 31.2 

 29.4 

 28.4 



19.1 

 19.1 

 20.2 

 19.9 

 20.2 

 21.1 

 21.0 

 20.2 

 21.1 

 20.6 

 20.0 

 19.1 

 19.1 



Jan. 31 to Feb. 28 



Feb. 28 to Mar. 28 ... . 



Mar. 28 to Apr. 25. _ 



Apr. 25 to May 23 



May 23 to June 20 



June20 to July 18 



July 18 to Aug. 15 



Aug. 15 to Sept. 12 ... . 



Sept. 12 to Oct. 10 



Oct. 10 to Nov. 7 



Nov. 7 to Dec. 5 



Dec. 5 to Jan. 2... 



Average ... 



26.2 



20.7 



26.5 



20.9 



32.1 



20.1 





Measurements of temperature were also taken with a maximum 

 and minimum thermometer placed in the lower part of the crown 

 of a Dillenia philippinensis, a typical second-story tree, and 

 another in the top of a dominant Parashorea plicata. The latter 

 thermometer was protected from the sun by means of a per- 

 forated wooden box. The maximum and minimum thermom- 

 eters were read weekly. In Table XLIII these results, together 

 with the weekly maxima and minima from the recording ther- 



