[26]

Pharbitis nil = Ipomœa cærulea June 15 1879

10° P.m. young seedling with cots .6 of inch to end of fork were horizontal & this supports former statement that young cots do not fall at night.—

Older cots 1.3 inch to end of fork; seedlings (with little leaf developed) are inclined at 25° & 38° below Horizon.

Leaves inclined at 68° & 70° beneath Horizon

In another pot at about same angle— (used) I must include amongst sleepers (a) Back

(a pot was turned on one side at 4° 30' P.m. & leaves Cotyledons at 10° P.m both stand round & are inclined downwards, — so I / cannot tell as weight would come into play after thus standing round

When pot placed so as to stand upwards edge of [illeg] Cots. face zenith — I think perhaps weight has does come into play)

(Cotyledons)

See p. 71 Ch I In these papers the sole important point— no heliotropism in Cots— young ones do not bend down at night. No pulvinus.

90 [-] 52 [=] 38 90 [-] 22 [=] 68

[26v]

16th 10° P.m the leaves on quite young plant of Ipomœa purpurea are even more depressed than those of I. cærulea some several of them hanging down quite vertically (Used)

17th all 7 Plants kept in study with darkened room, except 1 N E. window. & the leaves facing back of room has gone very little or not at all to sleep—)

The Cotyledon of The 3 5 young seedlings which faced light are

16th 10° P.m not asleep—

June 22d. 10° P.m. These same 3 seedlings viz (1) Cotyledons now 1. inch in length to end of fall, one inclined 60° & the other 55° below Horizon. (2) length 1.25 inch, Cots inclined 54° below Horizon. (3) length 1.1 inch Cots inclined 70° beneath Horizon.—

(An additional young seedlings with .7 of inch long, Cots 23° below Horizon.—) It is, therefore clear that cots do not become depressed at night till grown old— cannot be mere weight, though this may have caused initial movement.— One must doubt whether of any service in this case.

[in margin:] Cots gone much bigger this 1.25 inches