(1

1878

Oxalis rosea (p. 29. C)

Circumnutation & sleep of Cotyledons.

(Chili)

June 17th Hypocotyl tied to pin— with filament to one Cot & minute triangles of paper, observed under skylight. [sketch] Temp. 16-16 1/2 C.

Traced on vertical glass. See Tracing. Apex of Cot 5 inches from glass— Length of Cot .15 of inch. Therefore magnified only 4.3 times in middle of course. The Cot. was in constant & rapid movement all day — going 3 times down & twice up between 6° 45' (ie 5 times up & down a.m & 6° P.m; after which went down till depended vertically ascending & descending lines do not coincide — Sleep movement clearly only an exaggeration in evening of the daily movement. On following day (Temp 16 1/2 to 17°), moved in same general manner, but more frequently up & down 7 times; but some of the up & down oscillations were short & zig-zag. These occurred between 12° & 4°, after which great descent commenced.─ The Cot was of course sometimes above & sometimes below a Horizontal position.

(Used)

On 18th observed in same manner another Cot. but the Hypocotyl was not tied; no other difference, except that apex was only 3 3/4 inch from glass. & Cot. itself .15 of inch in length. So Tracing see, not so much magnified— Went 7 times up & down but course sho of oscillations short. These occurred between 2° 40' & 3° 5'.

(The Cots. become so much depressed after tying Hycotyl to pin that I thought must be sensitive, & this occurred again when I tied a thread round

[310v]

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