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March 12-15 1878 Apogeotropism

American Oak

Young Oak 10 inches height— seedling straight, bowed down so that tip stood about 5° below horizon— observed like Cytisus— first fell & then rose— Tracing less magnified than that of Cytisus.— (See tracing—) I think certainly here evidence of slight circumnutation— At end of observation filament only 32° above in H horizon.—

Began to rise at 9°. 30' 10° a.m. on 12' & continued till 10° 45 P.m.

Had risen very little during next night, & afterwards rose with extreme slowness — Even during first day, sometimes rose extremely little after equal intervals of time, growth then probably going on on upper surface — on second day remained for 8° almost on the same spot: Comparing this Tracing with that of Cytisus I can hardly doubt there was some circumnutation.

37° in

(some zig-zag)

(see Cytisus paper for Hours of observation)