362 I. W. BAILEY 
Table i {Concluded) 
Vessel-segments 
Cambial In 
itials 
Fiber Tracheids 
Max. 
Mean 
Mill. 
Max. 
Mean 
Mm. 
Max. 
Mean 
Min. 
22 Bombacaceae 
Bowbycidcndfon Viddli- 
anufn Merr. and Rolfe 
0-35 
0.2o 
0.43 
0.30 
0.32 
2.00 
I 62 
1.04 
23. Sterculiaceae 
HcftttCJ'd ItttOVCLllS 
Dryand 
0-37 
0.31 
0.25 
0.30 
0.30 
0.27 
1.88 
1.42 
0 q6 
KleinhovicL Jiospita L. 
0.50 
0-33 
0.19 
0 48 
0.36 
0.27 
1.24 
0.89 
0.52 
PtefospeffnuTfi ntveuw 
Vid 
0.50 
0-37 
• 9 
0-43 
0-37 
0.30 
1.48 
0 77 
u.// 
Stefculid foetidd L 
0 48 
0-35 
0.30 
045 
0-37 
0.32 
2.72 
2. II 
1.64. 
Tdfftetid sylvdttcd 
Merr 
^•34 
0.27 
0.18 
^•34 
0.28 
0.21 
1 .96 
1. 12 
X. 
Parietales 
24. Guttifera6 
CdlophylliivH Blttficot 
PI and Tr 
0.99 
0 61 
0.30 
.90 
0-59 
4 
T 'Z^ 
0.96 
0-54 
Gdvcifitd dulcts Idirz. 
1.24 
0 80 
0 48 
1.09 
0 80 
0.52 
2.88 
2.01 
1. 12 
GdTctntd sp. (probably 
IdtCTlfloTd Bl ) 
1.04 
0.78 
0 48 
1.02 
0.74 
0.52 
2.52 
1.88 
I 28 
2^. Dipterocarpaceae 
AfiisoptcTd thufifcfd Bl. 
0.66 
0 48 
0.30 
0.72 
0-54 
0.41 
2 12 
1.68 
1. 16 
Vdticd MdfLg^dcJidpoi 
0.79 
0.50 
0.36 
0.81 
■ 
0.41 
I 6^ 
0 61 
XI, 
]VI YRTIFLORAE 
Ldgefstfoeniid spcci- 
osd (L.) Pers 
0.43 
0.30 
0. 1 0 
0.50 
0-33 
0.21 
1.08 
0. 4 
27. Lecythidaceae 
Bdrringtonid rdcemosd 
(L.) Roxb 
0.97 
0.60 
0-39 
0.90 
0.72 
0.50 
3-o4 
2.51 
1.20 
28. Rhizophoraceae 
Bruguiera pdrviflord 
W. and A 
1 .20 
0.94 
0.00 
1 .2o 
0.99 
0.64 
T QQ 
1 .00 
1.32 
0.90 
Rhizophora sp. (prob- 
ably Cdndeldrid 
DC.) 
0.95 
0-59 
0.46 
0.95 
0.73 
0.30 
2.12 
1.56 
T 
I. 10 
29. Nyssaceae 
Nyssd sylvaticd Marsh. 
1.72 
1.25 
0.88 
1.27 
0.83 
0.54 
2.52 
1.76 
I. 16 
XII. 
Umbelliflorae 
30. Araliaceae 
Shefflerd odordtd Merr. 
and Rolfe 
1. 00 
0.82 
0.56 
0.97 
0.84 
0.66 
0.76 
0.52 
0.37 
B. Metachlamydeae 
XIII. 
CONTORTAE 
31. Oleaceae 
Ffdxinus dmericdud L. 
0.48 
0.31 
0.18 
0.37 
0.29 
0.18 
1.38 
0.96 
0.54 
XIV. 
RUBIALES 
32. Rubiaceae 
Ixord philippinensis 
Merr 
1. 13 
0.62 
0.50 
1. 17 
0.76 
043 
1.78 
1. 18 
0.66 
Psychotria luzoniensis 
F. Vill 
0-95 
0.67 
0.37 
1.08 
0,70 
045 
1-53 
1. 12 
0.61 
Variations in Cross-sectional Area and Volume 
The variations in the length of cambial initials are not neutralized by 
concomitant changes in the radial and tangential diameters of the cells. 
On the contrary, the cross-sectional area of the elongated meristematic 
