SYMMETRY OF THE CENTROSPERM X. 215 
Measurements along the main axis of specimen I10 commenced at the cotyledonary 
node. After having its first pair of foliage-leaves separated by a distance of 4 mm., the 
main shoot showed a reversion to the exact opposite phyllotaxis at the next two nodes. 
The internode-subcurve of the main axis is unusually irregular: it is possible that the 
abnormal length of the first internode was due to the main stem being deeply buried 
(though I made no note at the time indicating such a condition), 
The preliminary fall in the internode-subeurves of the first four branches, on the 
contrary, is easily explicable as representing a transition towards the purely descending 
form of curve which is attained in the 5th and 6th branches. 
Atriplex rosea 192. (Curves 3 m, 3 1-v.) 
31. 3 n. 3 nr. 81v. 3v. 8m. 
T HERES BENT 
Relatively main stem (Secondary) 0-5 14:5 54-5 27-5 176 37°5 47-5 |79 pas 29 265 9 |85| 4 499 | 
Ist Branch (Tertiary 1) ......48 96:5 59 B15 57 43 48 245 119 | 90 12 E | jb. 389 | 
ES (. 3... 64 | 45\76 |22 i58 (50555565 45 E 23 |165|95| 4| 548 | 
m vu (s. 98 e 54 425/51 |28 61-5 47-5 475 195 15 liz 45] 65| .. | .. 404 
B | (x 5. 81 50 745) 65.99 sus 66 31 osla e | dh. Lined oO 
5th accessory (Tertiary 5’) e 845 26 |70 |35 pos 37 s F | T | is | ee | DE 320 
Ea E s Pap annie tial MERC SER 
In the case of specimen 192 the relatively main axis was a secondary xis. In addition 
to showing the change of symmetry of the successive tertiary .xes, the specimen 
exhibited a number of “fusions” of the branches with relatively main axes, so that 
Supra-axillary branches were inserted on certain of the tertiary axes. (The Branches 
are numbered successively upwards, and beneath the fifth branch m the axil of the 
same leaf was an accessory branch, which is termed “ Vth accessory d 
SECOND SERIES.—BOTANY, VOL. VII. 2T 
