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Trifolium strictum Fig.

These 3 figures to be exactly copied: to each figure letters RC.— LC. & F to be added: on same block.— On same block or cut so close that Printer can arrange close together

Trifolium strictum. Diurnal & nocturnal position of the cotyledons & of the first leaf.

A seedling viewed obliquely during the day R C. right cotyledon. L C. left Cotyledon. F first true leaf

B. A rather younger younger seedling. RC drawn viewed at night. R.C. right Cot. raised, but position not otherwise changed. LC. left Cot raised & laterally twisted, F first true leaf raised & twisted so as to face the left twisted cotyledon.

C. same seedling viewed on opposite side at night. The back of first true leaf F is here shown instead of the front as in B.—

[Movement in plants, pp. 310-1: "Trifolium strictum: diurnal and nocturnal positions of the two cotyledons and of the first leaf. I. Seedling viewed obliquely from above, during the day: Rc, right cotyledon; Lc, left cotyledon; F, first true leaf. II. A rather younger seedling, viewed at night: Rc, right cotyledon raised, but its position not otherwise changed; Lc, left cotyledon raised and laterally twisted; F, first leaf raised and twisted so as to face the left twisted cotyledon. III. Same seedling viewed at night from the opposite side. The back of the first leaf, F, is here shown instead of the front, as in II. and the first true leaf (F) projects at right angles to them. At night (see II. and III.) the right cotyledon (Rc) is greatly raised, but is not otherwise changed in position. The left cotyledon (Lc) is likewise raised, but it is also twisted so that its blade, instead of exactly facing the opposite one, now stands at nearly right angles to it. This nocturnal twisting movement is effected not by means of the pulvinus, but by the twisting of the whole length of the petiole, as could be seen by the curved line of its upper concave surface. At the same time the true leaf (F) rises up, so as to stand vertically, or it even passes the vertical and is inclined a little inwards. It also twists a little, by which means the upper surface of its blade fronts, and almost comes into contact with, the upper surface of the twisted left cotyledon."]

[61v]

New Drawing

A seedling with the 2 Cots & first true leaflet in the diurnal position LC. left Cot R.C. Rt Cot. F. first true leaflet

(B) seedling a different seedling, viewed from a somewhat different point first L. C. left cotyledon raised; twisted somewhat round — RC right cotyledon raised but otherwise in same position as during day— — F. first true leaf raised.

(C) same seedling at night, viewed from the opposite side at night —

[Letter] of reference the same.