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1878 (1) Iberis umbellata, circumnutated of young stem. (Cruciferæ)

Sept 13 — The movement of the stem of A seedling young plant 4 inches high, consisting of 4 internodes, (including the beneath hypocotyl) Cots. besides shoot growing shoot or a large bud one of summit, had perpendicular filament affixed, & movements were traced in Horizontal glass, feebly illuminated only from vertically above in study. in manner described during 24 hours. (see Fig. [sketch]

As far as I we could judge about from its appearance a length of of stem about one the [illeg] inch of the stem alone circumnutated. Distance from summit of stem to Horizontal glass 7.6 inches, therefore Tracing magnified between 8 & 9 times??

Observed from 8° 30' a.m. on 13th to 8° 30' on 14' see Tracing.

Clearly is a slow circumnutator,— but made one principal ellipse in about 6° 30'— Rate of movement very unequal.—

The movement was slow & very unequal at different times; in part of its course, as may be seen, an irregular ellipse, or rather triangle, was formed & completed in 6° 30'.