436 
The Philippine Journal of Science 
Plate 6 
1921 
Fig. 1. A walk on top of a dike; the side toward the canal is thickly 
planted with trees. 
2. A much-widened and deepened ditch in an old Nakorn Chaisri 
pummelo orchard. 
3. Trenching as carried on by Chinese labor in a Nakorn Chaisri 
orchard. 
Plate 7 
Fig. 1. Network of trenches, showing the effect of washing by rain in a 
Nakorn Chaisri orchard. 
2. Logs and bamboo poles thrown across the ditches to serve as foot 
bridges. 
3. Betel palms, Areca catechu Linn., growing along the edge of citrus 
beds. 
Plate 8 
Fig. 1. Betel palms, Areca catechu Linn., growing along a walk in the 
citrus orchard. 
2. Betel palms, Areca catechu Linn., interplanted with citrus trees. 
3. Tall betel palms, Areca catechu Linn., scattered throughout a citrus 
plantation, providing a semishade for the pummelo trees. 
Plate 9 
Fig. 1. A much-widened ditch along the edges of which rice may be 
planted during the rainy season. 
2. Dead leaves, straw, and removed wood allowed to rot under the 
trees. Low-headed pummelo tree, branching from the surface of 
the ground. 
3. A pile of rice-paddy ash at the base of a pummelo tree in Nakorn 
Chaisri. 
Plate 10 
Fig. 1. A shapely, well-rounded, low-headed tree of a Nakorn Chaisri 
seedless pummelo. 
2. The lower branches of a Nakorn Chaisri seedless pummelo lying 
almost flat along the surface of the bed and extending over the 
trench of water. 
3. A low-headed, spreading tree of a Nakorn Chaisri seedless pummelo. 
Plate 11 
Fig. 1. Flowers and newly developed fruits formed on young stems, which 
shoot out quite upright from the branches of the previous year’s 
growth. 
2. A mass of old flowers and newly developed fruits produced from a 
single flower stalk. 
3. A flower of a Nakorn Chaisri seedless pummelo. 
