XIV, 5 Yates: Growth of Hevea Brasiliensis 509 
_ The samples were taken at a depth of about 30 to 40 cen- 
timeters. Sample 1 was taken from a block planted to Para 
rubber in which the growth of the trees was very poor. The 
trees presented an unhealthy, ill-nourished appearance. It is 
interesting that analysis of the soil from this block showed it to 
be low in all inorganic substances necessary for plant growth. 
In Table VI are given analyses of other soils from the Min- 
danao region of the Philippines, in Table VII analyses of Ceylon 
soils are tabulated for comparison, and in Table VIII analyses 
of soils from the Federated Malay States are given. The Ma- 
layan soils are characterized by their richness in nitrogen. 
TABLE VI.—Philippine soils. * 
Lake Lake i 
| Fort Lanao, | Lanao, | Saran- | 
cota) BIR, | naeh | auth | eae 
| cm. 10to 40 | 10to40 | em. 
cm. em. 
MMU TG ING gc ey a eee ee 161 159 150 153 165 
Motetute <2 ee Se eee ee 8.35 18, 47 16.61 3.56 4.48 
Toes on lgnition 2.255 6 ee 10.16 11.39 19.47 7.80 5.58 
Nitvoweri CN} oo. Se ees 0.207 | 0.184 0. 216 0.173 | 0.115 
Phosphoric anhydride (P205) _____..______-__- 0.142 0.196 . 0.180 0. 097 0. 188 
Die CORON so ee i ee 0. 87 192) FT 2.24 8.18 
Magnesia. tig) 2 ee ae 9 oes Geren. Meet Dancer aerate 0.71 
Datel CRW oo 0.29 | 0.55 | 0.240 | 0.173 | 0.24 
RGR SINREOD 6s oa Se ee He ta Be Sag ek, SPR ONCTi, IRE Re eee ee 
WRONG s tescs Sareea mis ics Ce ec nk 3.25 2.12 2.55 2,17 
Soil acidity (per cent CaCOs) 22.2 o0o2 obo eee 0. 0036 0. 0022 0.0072 | 0.0000 
Detritus—not passing Imm sieve ____.___.___.|-__._-___- small small 2.29 small 
Coarse sand; 1.0 4600.5 tii ed ae 0.99 2.61 3.81 5. 76 
Mediom sand, 0.5 to 0; 26 mm 43. 4.33 13.20 27. 68 19.37 
Fine sand, 0:25 te 0.10 min 26 a ee ke 7.11 18. 80 24.81 25.84 
Very fine sand, 0.10 to 0.05 mm_____-.-..-.----|.--.--.--- 13.81 | 13.82 18.09 18.08 
Silt; 0; 06 to 0.008 tm cos eh 59. 30 | 28. 48 20, 45 23. 20 
Clay, less than 0.005 mm ___.--_- PERRY Eos pal Meese 14.11 | 28.61 5.85 7.89 
leases 99. 65 100. 52 100.19 100.14 
u 
* Cox, Philip. Journ. Sci. § A 6 (1911) 279-830, from Table VIII, p. 309, and Table IX, 
pp. 314 and 815. e 
