[133]

(Jar A

April 26th 1879. Phaseolus Radicles with Caustic

8º a.m. each with 10 mm dot suspended horizontally over water in dark

(Pinned in various positions.) Temp. 68º-70º F. Touched with caustic for 4 or 5".— germinated in sawdust on chimney Piece.— Placed on Chimney Piece

(1) 1 caustic 4. 30' after 8º. 30' — Hardly a trace of G. in tip length 14 mm (27th 7º 45 a.m. after 24 hr quite horizontal but curved a little laterally length 22 mm.— Black point 1/2 mm See for movement of tip

(2) (0) 4º 30 vertically geotropic (27th 7º 45' a.m length 31 mm, almost vertically geotropic

(3) caustic

(3) caustic 4º 30 absolutely horizontal 16 mm. (27th 7º 45 26 mm. perfectly straight

(2) see measure for length of colour tip

4 (0) 4º 30 about 30º 20º measured from vertically geotropic (27th 7º 45 less geotropic (look too dry) length 25 mm.

(5) caustic 4º 30 absolutely straight Length from dot 14 mm. (27th 7º 45' not at all geotropic— length 19 mm. (3) from movement

6 0 4º 30' about 45º 58º 32º (measured) from vertically geotropic Length (27th 7º 50' rather less geotropic, length 21 mm

7 caustic 4º 30 quite straight length 13 1/4 mm (27th 7. 50' quite straight length 20 mm. (4)

(8) 0 4º 30' about 30º 32º 58º (measured) from vertically geotropic (27th 7º 50' almo vertical like last evening, length 25 mm.

(9) caustic quite straight length 16 mm. (27' 7º 50' perfectly straight length 25 mm.

(5) marked IX for measurement

(See Back for measurements of 3 tips) (over)

[33v]

Continued

10 (0) 4º 35. 53º from vertical (27th 7º 50' less geotropic length 31 mm.

(11) caustic 4º 35 quite straight length 13 mm. (27' 7º 50 perfectly straight length 22 mm. (6)

Take average of length.

(on an average 27º from the vertical 8 controls)

⨀  20 [+]   [+] 32 [+] 32 [+] 53 [=] 167 [÷] 6 [=] 28º

(z with the 6 specimen in damp air, the terminal young portion, up 10 mm, in height is lost had more than doubled itself in length in the time 24h for it was now on an average 20. 66 7 in length. long

00 [+] 20 [+] 32 [+] 32 [+] 53 [=] 137 [÷] 5 [=] 27.4

Q It may be added that on a former occasion when first experimenting on the effects of touching one side of the tip with caustic, too much was applied, & the whole tip was killed, of 6 radicles horizontally extended radicles & these all continued for 2 or 3 days to grow out horizontally. —