177

(12

Oats. Grease

Temp. 4.8 C on Nov 28. 10 am; Sieve 30º above

greased 1.5mm on one root 2. 48 pm   Nov 27 & marked another not greased. After 19 hrs the not greased one is bent sharply over the greased has grown sticks out at rt angles; it continued to grow till the next day (ie Nov 29) & was still vertical.  O

Nov 28. 9. 55 am greased 1. to 1.5 mm on 8 roots projecting 2.5mm to 4 mm;

The following table gives the angle at which they were when greased, and then when examined 22 1/4 hrs afterwards, when they had grown so as to be have from 5.5mm to 7 mm projecting

                         Greased       Examined O

 1      15 inside vertical        5º inside, ie has gone 10º away from wet

             2      10 outside       Geotropism wd acnt for 10º — so hs gon 20º to wet 30º inside ie has gone 40º towards wet

             3      15 outside       50º inside has gon 35º ie has gone 65º towards wet

             4      vertical            10º inside ie has gone 10º towards wet

 5      35 inside         60º inside (on wet) flat against ie has gone 25 25º (60º), as far as it could, towards wet

3/9 (+) 1/4 = 4/13

 6      15 inside         25º inside has gone 10º towards wet O

 7      ?          }

10º outside O

 8      ?          vertical

Have certainly not gone towards wet

Of  these, numbers 2, 3, & 5 have gone very much towards wet— The rest have either not gone towards wet or not gone more than 10º—

Control Nov 29— Looking carefully I could only see one

ungreased one that sticks out like the greased ones did. The very numerous un greased ones being quite flat on the wet

178

13 (2

Oats. O Grease

Nov 29. 9. 30, greased abt 1.5 mm on 4 roots which vary from 2 to 3 mm. They were examined after 25 1/4 hrs when they were from 5 to 5.5 mm long.

                        As. greased     When examined

  1  15º inside        gone flat on wet ie moved 45º towards wet O

  2  vertical            10º outside vert = moved 10º away fron

              3  vertical            30º inside ⸺ moved 30º towards  f

  4  20º inside        gone flat — moved 40º towards

Control (Nov 30)

The appearance was most striking Every one of the ungreased, certainly more as many as than 40—50 roots, flat against the wet, & the black tips only sticking up. This one I showed C.D

To find out where the bending place, I observed a few ungreased ones; the first projected 4.5 mm nearly vertically down; when examined 19 hrs after it was bent over at its base. From this one can only say that the bending place is not nearer less than 4.5 mm from the tip. Two others projecting 5.5mm and 3.5mm were found bent at their base after 12 1/2 hrs when they had grown to 10 & 7 mm. Therefore the bending place was not less than 3.5—5.5 or more than 7—10mm from the tip.

Five of the black tips measured under microsope are were 1.2mm, 1.3mm, 1.5mm, 1.2mm, 1.3mm

178v

Chlorophytum G July 13 

 16     8º   9. am C9

 dark