SYMMETRY OF THE CENTROSPERM X. 293 
those of the lowest pair of foliage-leaves. The next two pairs of leaves were decussate, 
or approximately so, as regards divergence, though separated by a considerable length 
of stem. The following are the measurements made :— 
0, 13, 14 (circa), 38, 38, 58, 66, 74, 70, 66, 82:5, 16:5, 73°, 60, 52, 74, 86, 17, 42, 215, 
24, 18, 16, 26-5, 1:5 (circa), 11, 15°5, 0 (circa), 11°5, 3, 7°5, 11, 3°, 4. 
Where the curve descends to zero the shoot is in the inflorescence region, and a 
phyllotaxis commences in which two subopposite leaves ata node decussate with a single 
leaf at the next node, as if at a number of alternate nodes one leaf in a decussate 
arrangement were suppressed. The measurements stopped at about the middle of the 
terminal compound inflorescence. 
Branch x was inserted at the fifth node (marked by a x in the curve). Its successive 
measurements were :— 
4, 42, 63, 66, 25, 70, 49, 57:5, 43:5, 34, 18, 28, 8:5, 8, 7°5, 0, 0. 
The measurements ceased at the commencement of the compound inflorescence, where 
the bracts began an arrangement in decussating pairs of opposite or subopposite leaves, 
and rapidly dwindled from small foliage-leaves to small bracts. 
AMARANTHUS POLYGONOIDES. (Curve 20.) 
This annual plant was uprooted, and measurements were begun at the lowest two 
Scars which were opposite (and possibly represented the points of insertion of the 
cotyledons). The next pair of leaves were decussate in divergence, but separated by a 
considerable length of stem. The following are the measurements made :— 
0, 20,17, 78, 83, 68°5, 125, 65°5, 78, 97, 54°5, 10475, 82°5, 74, 110, 67*5, 47, 64, 16, 42, 
29:5, 2, 39:5, 5°5, 26:0, 21, 0, 23°5, 12, 3'5, 19, 0, 11, 10, 2. 
Where the curve first sinks to zero the shoot is wholly reproductive—that is to say, it 
2x 2 
