fall from the first leaf may fall onto the fourth or—in other trees—onto the sixth.
419.
Every shoot and every fruit is produced above the insertion [in the axil] of its leaf which serves it as a mother, giving it water from the rain and moisture from the dew which falls at night from above, and often it protects them against the too great heat of the rays of the sun.
LIGHT ON BRANCHES AND LEAVES (420—422).
420.
That part of the body will be most illuminated which is hit by the luminous ray coming between right angles.
[Footnote: See Pl. XXVIII, No. 1.]
421.
Young plants have more transparent leaves and a more lustrous bark than old ones; and particularly the walnut is lighter coloured in May than in September.
422.
OF THE ACCIDENTS OF COLOURING IN TREES.
The accidents of colour in the foliage of trees are 4. That is: shadow, light, lustre