[209]

Bead of shell-lac 1/100 of gr. sufficed with Bean (p. 8)

Force compared with geotropism. p. 226 235

Conclusion Ch

Compare sensitiveness of tip of radicle to long-continued pressure contact with that of tendril of Passiflora gracilis & of glands of Drosera— — far less sensitive than latter— — nor must we overlook fact that tip protected by root-cap so cannot be explained merely by thinness of cuticle, (as Huxley thought)

Like glands of Drosera tip of radicle of Bean sensitive only to prolonged contact & not to rubbing for even 1m.—

Each speck of [illeg] separately weighed less than 1/100' of a grain

[209v]

Radicles of the 2d order — secondary or lateral rootlets— circumnutate— there tips sensitive to contact— acted on in special manner by geotropism— almost transversal geotropic — little declined downwards—

p 154 Climbing Plants — bit of Platinum wire just sufficed to cause circumnutation Passiflora gracilis

weighed 1/50' of gr (1.23 mg.)

p. 263 Insectivorous Plant

Human Hair

1/78740 gr. (or .000822 m.g sufficed

1/100 of gr = (0.62 mg)