[183]

Drosera rotundifolia.— movement from meat not due to modified circumnutation.

Put old leaf under compound microscope weak power, so that each division of micrometer equaled 1/500 of inch. In N. E. window no sign of Heliotropism.

Fixed back of leaf with shell-lac to stick.— Cut away a few tentacles on one side so as to [recover] the same — Plant placed embedded in compact wet sand.— During first 15' moved about 1/1000 of inch readjusted, & looked frequently from 9° 15' to 4° 50 (ie for 7 1/2 hours) & in this time moved only 1/1000 of inch probably due to slightly settling of sand. Therefore old tentacles, though secreting copiously do not circumnutate & not in the least Heliotropic.

Tried several adjoining glands with atoms of meat & all moved in less than 1'.

The one observed had secretion merely touched 2 or 3 times, during 1 or 2 second with raw meat & certainly →

[183v]

Drosera rotundifolia

moved in 23" after the touching. Shows how absolutely distinct movement from an excitement is from the absorption of animal matter by gland.— As growth seem invariably accompanied by circumnutation, we may infer that Batalin is in error in saying due in part to growth.