[54]

Annales des Sc. Nat. (4th S.) Bot. Tom IX 1858

p. 164. M. Ratchinsky "Notice sur quelques movements opérés par les Plantes"

p 167 considers Dutrochets hypothesis of incurvature of tissue by oxygenation quite gratuitous

p. 172. shown by various authors that the bark tends to curve towards the light.

p 173 He concludes that the power lies in the Bark. (compare Bark of weeping & upright Ashes.)

p 175 considers cause to lie in the turgescence of the inner layer of the bark, owing to chemical action there going on from the influence of the light.—

But When I cut off convex part of inflated tentacle, it seems to me impossible that the turgescence of the inner cells, now having no external support cd have caused the continued incurvature — I lean strongly to contraction theory I see that R. thinks this a wild notion — give it on Cohn & Wiegmans' authority.