[110]

Canary grass— Light

Dec. 4th. brought pot in morning from Hot-House & put in dark closet, & observed soon — Bad plan as change of temp & shaking wd prevent check sensitiveness— put under microscope with bichromate light— no plain movement— [calculation not transcribed]

Removed bichromate & during first 10' moved 2 or 3 divisions from light! After additional 5' had moved 1 division ie 1/500 of inch, to light — After interval of few minutes crossed 2/500 in 4' 23' — After about 10 or 12' additional crossed 2/500 in 3' 30" so moving quickly— After interval of 21' crossed 2/500 in 2' 3".— After interval of 25' crossed 2 divisions in 1 exactly 1'— never saw such quick movement.— After interval of 17 Frank saw roughly 5 divisions crossed in 2' 50". (After 3' interval crossed 4 divisions in 2' 37", thus very accurate— After interval of 12' crossed 5 divisions in 3' 32" (not so accurate) After interval of 12' crossed 2 divisions in 2' 40" accurate. These observations will show mean rate of movement.— By the gummed spec I could see how much more in a few Hours.—

(The pure light was turned on the above pot a little after 8° a.m & by 10° 20' every seedling in pot had all their points directed in conspicuous manner to light.— Put it under brown-paper night-cap at 10°. 35' (for apogeotropism)

(over)

[110v]

Dec. 7th I tried another young seedling with light, but cd detect no trace of movement at first to light— remained full 10' before any sign of moving to light & I got tired of experiment & did not see any movement to light.