xii, a, 5 Brown and Argiielles: Soils on Mount Maquiling 229 



tions in water content. Some of the variations seen in Table III 

 are undoubtedly due to the selection of individual samples and 

 are not connected with any change in the water content of the 

 soil as a whole. It is probable that this source of error is 

 responsible for the extreme variations noted in the water con- 

 tent given in Table III. The soil at a depth of 10 centimeters 

 gives an average water content for November of 38 per cent 

 and for April of 27 per cent. These figures would probably 

 represent the extreme variations for the region as a whole more 

 accurately than the highest and lowest figure shown in Table III. 

 The figures for April show that even in the dry season the soil 

 contains considerable moisture. The lower moisture content 

 combined with the dry atmospheric conditions at this season are, 

 however, sufficient to affect the plants very adversely. Many of 

 the second-growth tree species loose their leaves completely for 

 longer or shorter periods, and all of them show a much lower rate 

 of growth during the dry season than at other times of the year. 



Table IV. — Percentage of moisture in soil in dipterocarp forest (altitude 

 300 meters) on Mount Maquiling, Laguna Province. 



1912. 

 November 15 ... 



22... 



29... 

 December 6 ... 



13 — 

 20... 



27 — 

 1913. 



January 3 ... 

 10... 

 17 — 

 24 — 

 31... 



February 7 ... 

 14... 

 21... 



March 7 ... 



14 ... 

 21 ... 



28 ... 

 April 4 ... 



Depth in centi- 

 meters. 



i 



10. 



20. 



30. 



57.4 



57.1 



1 

 56.6 j 



57.2 



59.5 



56.5 



57.2 



57.8 



58.6 | 



55.2 



57.8 



56.5 



53.1 



54.4 



52.3 



54.2 



52.4 



56.2 ! 



60.4 



54.6 



54.5 



65.5 



54.7 



57.0 



53.8 



52.2 



54.2 ! 



51.2 



47.2 



54.9 1 



53.6 



57.4 



60.0 



54.6 



54.4 



56.3 1 



47.1 



45.8 



51.7 



47.6 



50.5 



53.5 



55.6 



52.5 



48.0 j 



44.9 



48.1 



47.1 



47.5 



52.4 



51.5 



45.9 



46.7 



47.9 



39.0 



45.0 



50.3 



40.6 



44.1 



48.8 



42.4 



41.4 



44.5 



41.3 



42.6 



44.5 



52.1 



49.4 



49.8 



42.1 



47.6 



44.8 



1913-Cont. 

 May 2 



July 



August 



September 5. 



12. 



19. 

 October 3. 



24. 

 November 7. 



14. 



December 12. 



54.8 

 53.0 

 58.1 

 64.5 

 55.4 

 54.8 

 57.0 

 55.4 

 56.1 

 55.2 

 55.1 



55.2 

 57.2 



[ 55.4 

 59.1 



