422 : BOTANICAL GAZETTE [DECEMBER 
the stipes of a great many specimens in all stages of development 
were measured. An accurate record of the length of the stipe at the 
beginning and end of growth was kept. The stipe was marked off 
into 2™™ lengths with dots of waterproof India ink. It was possible, 
Fic. 10 Fi, 11 
Fic. 10. A. crenulata, 24 hours after planting; base of stipe held in glass tube; 
tip curved 145°.—Fic. 11. A. sane, 24 hours after planting; base of stipe held in 
glass tube; tip curved 23°. 
when growth ceased, to tell in what region elongation had taken 
place and where it was most rapid. A few of these records are given 
below. 
n 
.] eo i O a 
4/8 /ele |g Bg ‘ g Bees Ca 
ic rh, 2 a = oo - S . aw | 3 
3/38 3/6 | or a 3 Fs 2, tS | Ss 
» & 15 S28 o ay n gaa en 
& /A | 8 be ee 3 E Se | 2% 
“3 a] 2 g =] sR cs i>! & “Bo & 
a 7 o 3 ald E = a 9d ve 
i 4 silo 18 aoe “ o es ei eg 
, |Ss1° | 218 jee Seq 2 2 = gz | 33 
5 2 |S 64 Be > > = =I be] 
5 |S Bla Sis |ss 20.5 =) a so ao 
eM et) 2h vo bo Sp ~ am a am ag cr) 
| esiagi g BO) gw gao a rol + es ES & 
5 |/o-|o% &§ aos eee of] 6 = 
Zin |i a 12 25) 4 4 A Oo 3) 
mm./mm./mm.|mm.|mm 3 m mm. mm. % % | hours 
110 7 | 33 | 26 © | 7-10-53-34-0 2 100 36 
216 | 20 | 50 | 30 | 20] 0 | 3-3-3-3-5 4-3-2-2-2 4 100 36 
218 | 30 | 68 | 38 | 30 | 0 | 2-2-3-3-4 4-4-3-3-2 ese 1-1 44.1 | 100 36 
157 | 40 | 72 | 32 | 40 | © | 3-4-3-3-2 2-2-I-I-1| I-1~1-1-1| I~1-1-1-1] 55.5 | 100 36 
104 | 20 | 34 | 14 | 20 | © | 1-2-2-2-2 I-I-I-I-1 58.8 | 100 36 
142 | 30 | 42 | 12 | 20 | ro | 2-2-2-1}-14 | 1 971.4 | 66.6] 36 
148 | 42 | 52 | 10 | 20 | 2 I-2-I-I-1 i-1-1-44 80.7 | 47.6} 36 
138 |102-|104 | 2| 81 9 4 98 7.8] 36 
123 | 36 | 364 4] 2 | 34 | 4-c-c-o-0 : 08.6 5.5] 36 
The specimens described above were grown in a horizontal posi- 
tion, and the measurements were taken on the lower side. Comparing 
the length of the stipe at the beginning and at the end of the experi- 
ment, and then comparing the length of the zone of elongation with 
the length of the entire stipe when the first measurement was taken, 
we find that elongation takes place throughout the entire length of 
the stipe until after it is 60 per cent. grown. From this time until 
ee 
Ree TPE ed ee wee coe 
ey She aed 
Ss a Bid oh 
