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Show 136 SENSITIVENESS OF THE APEX CHAP. III. (3.) Radicle 11 mm. in lengt.h, card fixed behind: after 9 h. deflected in tho plane of the bean 40° from tho perpendicular and from the card, and in opposition to Sachs' curvature. Tho tip of the radicle more curved than the upper part, but in the same plane. After 23 h. the extreme tip was slightly bent towards the card; the general curvature of the radicle rcmah:jug the same. (4.) Radicle g mm. long, card fixed behind and a little laterally: after g b. deflected in tho plane of the bean only about 7° or 8° from the perpendicular and from the card, in opposition to Sachs' curvature. There was in addition a slight lateral curvature directed partly from the card. After :J3 h. no change. (5.) Radicle 8 mm. long, card affixed almost laterally: after 9 h. deflected 30° from the perpendicular, in the plano of the bean and in opposition to Sachs' cm·\·ature ; also deflected in a plane at right angles to the above one, 20° from the perpendicular : after 23 h. no change. (6.) Radicle 9 mm. long, card affixed in front: after 9 b. d<r fleeted in the plane of the bean about 40° from the vertical, away from the card and in the direction of Sachs' curvature. Here therefore we have no evidence of the card being the cause of the deflection, except that a radicle never moves spontaneously, as far as we have seen, ac:; much as 40° in the course of 9 h. After 23 b. no chango. (7.) Radicle 7 mm. long, card affixed to the back : after 9 h. the terminal part of the radicle dt:flccted in tho plane of the bean 20° from the vertical, away from the card and in opposition to Sachs' curvature. After 22 h. 30 m. this part of the radicle had become straight. (8.) Radicle 12 mm. long, card affixed almost laterally: after g h. deflected laterally in a plane at right angles to that of the bean between 40° and 50° from the vertical and from the card. In the plane of the bean itself the deflection amounted to so or go from the vertical and from the card, in opposition to Sachs' curvature. After 22 h. 30m. the extreme tip had become slightly curved towards the card. (g.) Card fixed laterally: after 11 h. 30m. no effect, the radicle being still almost vertical. (10.) Card fixed almost laterally: after 11 h. 30m. deflected goo from the vertical and from the card, in a plano intermediate between that of the bean itself and ono at right CHAP. III. OF TilE RADICLE OF TilE DEAN. 137 angles to it. RadiclE' consequently partially deflected from Sachs' curvature. (11.) Tip of radicle protected with golclbeators' skin, with n. square of card of the usual dimensions affixed with shelliUl: llfter 11 h. greatly deflected in the plane of the bean, in tho direction of Sachs' curvature, but to a much greater degree and in Jess time than ever occurs spontanoon. ly. (12.) Tip of radicle protected ns in laRt rase: after 11 h. no effect, but after 24 h. 4.0 m. radicle clearly deflected from the card. This slow action wa.s probably duo to a portion of the goldbeaters' skin having curled round and lightly touched the opposite side of the tip and thus irritated it. (13.) A radicle of considerable length haa a small square of card fixed with shellac to its apex laterally: aft r only 7 h. 15m. a length of ·4 of an inch from tho a.pcx, moasm cd a.long tho middle, was considerably curved from the ·ide bearing the caret (14.) Case like the last in allrcRpects, except that a length of only ·25 of an inch of the radicle was thus deflected. (15.) A small square of card fixed with shellac to the apex of a young radicle; after 9 h. 15m. deflected 1hrongh uoo from the perpendicular and from the card. After 24 h. deflection much decreased, and after an additional clay, reduced to 23° from the perpendicular. (16.) Square of card fixed with shellac behind the apex of a radicle, which from its posHion ha.ving heen changed during growth had become very crooked; bnt tho terminal portion was straight, and this became deflected to about 45° from the perpendicular and from tho card, in opposition to Sachs' curvature. (17.) Square of ca1·d affixed with shellac: after 8 h. radicle curved at right angles from the perpendicular and from tho card. After 15 additional hours curvature much dccrca ed. (18.) Square of card affixed with shoiJac: aftm· 8 h. no effect; after 23 h. 3m. from time of affixing, radicle much curved from .the square. (19.) Square of card affixed with shellac: after 24 b. no effect, but the radicle had not grown well and scorned sickly. (20.) Square of card affixed with shellac: after 24 h. no effect. (21, 22.) Squares of card affixed with shellac: 11ftcr 24 b. radicles of both curved at 11bout 45° from tho perpendicular and from the cards. · (23.) Square of card fixed with shellac to young radicle: after |