338 BOTANICAL GAZETTE 
| NOVEMBER 
of additional color 18 occurred in the summer and Io in the fall. 
Color is more often lost in the leaf than in the stem, the cases 
of its persistence in the leaf through summer and fall being 8, of 
its loss 36. The percentage of increase in color is greater in 
stem and petiole than the loss; it is less in the leaf blade; and 
about the same in the 
veins. 
In order to determine in what 
tissues the red color is present, examination of 207 plants was 
made with the microscope. 
The following tables give the 
results : 
Stem. Petiole, Leaf-blade. Veins, 
FE PIAGERNIS sto cc Sesccre aco ac 41 12 
Hypodermis...... 3 29 t 15 5 i 
66 47 18 9 
cortex | Coenchyina eres 28 136 18 97 | 3 55 4 25 
} Parenchyma...... 65 49 37 16 ( 16 
| Sclerenchyma. ....] 5 _ 4 i) = ' 
Vasc. bundles..... 3 I 
Stele { We wis 2 15 
DRY, SHADY PLACES. 
Stem, Petiole. Leaf-blade. Veins. 
EDIGGTHNG 5 wads svar eeee. 9 6 4 e) 
—— Pears ar 8 ; Bis 2 I ‘ 
pitts | emdeue cl tas ‘ ts i brs " 3 
LE seaenegs 13 9 9 20 4 
Sclerenchyma.....| 2 t 15 fo) t 9 fo) 9 ° 
Vasc. bundles..... I fe) : 
— ia a : I 
DRY, SUNNY PLACES. 
Stem. | Petiole, | Leaf-blade. Veins. 
i 
Epiderit ioc, i crease: 18 20 6 
PMs oo ee 18 ' 9 8 3 t 
Cortex sere are 353 > 62| 9 . 42 8 me ’ 8 
renchyma ......| 29), 19 16 4 
Sclerenchyma..... 05 79 ih ) = of 3 
Vase. bundles..... I 
Stele de 3 ; 4 
i 
iq 
