[87]

1880

Ipomœa leptophylla

March 7th at 10° 8' pinned seed to lid of jar with the double petioles (radicles not measured) .2 inch long & placed horizontally

At 8° 30' P.m. double petiole .34 long & inclined about 45° beneath horizon

March 8th 8° 30' a.m — the upper par basal part of petiole for length of above .1 vertically dependent— the upper part for length of about .2 still at about 45° beneath horizon.

This good case showing that petioles at first geotropic, but very soon lose power — in course of day — lower or basal part still retaining power.

[88]

March 8

Ipomœa leptophylla

One has germinated with very long petioles to Cots still within seed-coats now cots. at right angles but were more more bent, & with well developed radicles — no plumule as Frank says, ie almost hooked— In another seed just germinating it appears that the 2 petioles at first protrude with no radicle, thus. [sketch]

(10th The petioles have now bent almost perpendicularly downwards & have increased greatly in length— in darkness, & therefore certainly geotropic— The terminal looped part was laid on 8th quite horizontally — a small weight was placed over peat earth at on seed.—) so I think point a little increased in length — now Hooked [sketch]

12th.— The Petioles are now doubled thus & the apex of petioles turned a little up!! it was brown — perhaps apex of radicle killed; We shall see.

[sketch] (I believe basal end of petioles geotropic & upper end apogeotropic) (over)

[88v]

March 13th — Double petioles now [illeg] with terminal portion directed back towards seed — tip slightly browned & blunt—; but tip has grown, for dotted line now .2 in length [sketch]

16th true radicle has not grown at all— browner than ever

[89]

[annotated sketch]

[89v]

[Printed matter]

[90]

March 17/80

Ipomœa leptophylla

8° am 2 have germinated & both seeds long flat at surface & have bowed petioles rectangularly downwards— the seed with 2 pins only just protruded— Both seed set vertically in peat to see if the petioles will straighten themselves by geotropism— In dark

18th 7° 45' a m — The young has quite straightened itself & the older almost completely

(March 21. The plumule has come up straight between bases of petioles of the 1st seedling— no doubt passage made for it.—) —This repeated in 2d case.

(over)

[90v]

March 26 a specimen which had been pinned through Cot. to cork lid, so that cots themselves has now lifted vertically the upper part of petiole for length of .5 inch until we come to the curvature for breaking through the ground where the petioles are above .15 in length — near the blades.— The base of petioles for length of .35 inch has not turned up & this is the part which is geotropic— Very curious to see geotropism & apogeotropic & hyponastic or epinastic growth, thus distributed through same organ. I believe it is Hyponastic

It is Epinasty.