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1879— April

Smithia Pfundii (This might come in at p. 414 after de Vries.

Those who have read last paper by Sachs will see how complex are the process which determine position of parts, & will therefore not feel surprised that I doubt how much of rectangular position of end shoot due to epinasty, apoheliotropism & geotropic.—

Plants with rectangular tips placed in dark cupboard on March 30th, on next day 2 of shoots I believe had straightened; on April 2d all shoots straight April 5th placed in light again — on 9th 2 of them beginning to be rectangular curve, on 11th one rectangular — On 18th put again in dark, plant with 6 shoots rectangular — on 20th greatly raised & some almost vertical. 21' two uppermost almost completely vertical — 22 two others completely vertical — (I conclude that shoot grow out rectangularly by epinasty & are kept down by by apheliotropism — They are, lower certainly apogeotropic

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anyone who reads a paper paper [illeg] publish by Sachs * will see how difficult a subject this is.