Chap. III. OF THE RADICLE OF THE BEAN. 137 



angles to it. Eadicle consequently partially deflected from 

 Sachs' CTirvature. 



(11.) Tip of radicle protected witli goldbeaters' skin, with a 

 square of card of the usual dimensions affixed with shellac : 

 after 11 h. greatly deflected in the plane of the bean, in the 

 direction of Sachs' curvature, but to a much greater degsee and 

 in less time than ever occurs spontaneously. 



(12.) Tip of radicle protected as in last case : after 11 h. no 

 effect, but after 24 h. 40 m. radicle clearly deflected from the 

 card. This slow action was probably due to a portion of the 

 goldbeaters' skin having curled rour.d and lightly touched the 

 opposite side of the tip and thus irritated it. 



(13.) A radicle of considerable length had a small square of 

 card fixed with shellac to its apex laterally : after only 7 h. 15 m. 

 a length of '4 of an inch from the apex, measured along the 

 middle, was considerably curved from the side bearing the card. 



(14.) Case like the last in all respects, 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. 15 m. deflected through 90° from the 

 perpendicular and from the card. After 24 h. deflection much 

 decreased, and after an additional day, reduced to 23° from the 

 perpendicular. 



(IC.) Square of card fixed with shellac behind the apex of a 

 radicle, which from its position having been changed during 

 growth had become very crooked; but the terminal portion 

 was straight, and this became deflected to about 45° from 

 the perpendicular and from the card, in opposition to Sachs' 

 curvature. 



(17.) Square of card affixed with shellac : after 8 h. radicle 

 curved at right angles from the perpendicular and from the 

 card. After 15 additional hours curvature much decreased. 



(18.) Square of card affixed with shellac: after 8h. no effect; 

 after 23 h. 3 m. from time of affixing, radicle much curved from 

 the square. 



(19.) Square of card affixed with shellac : after 24 h. no effect, 

 but the radicle had not grown well and seemed sickly. 



(20.) Square of card affixed with shellac : after 24 h. no effect. 



(21, 22.) Squares of card affixed with shellac : after 24 h. 

 radicles of both curved at about 45° from the perpendicular and 

 bom. the cards. 



(23.) Square of card fixed with shellac to young radicle : after 



