[29]

(32

Utricularia

was examined after 2 h 30 m, and the other three after 23 h, but there was no marked change in the glands of any of them.

(Two specimens with quite colourless glands were irrigated with a solution of 2 gr. of carbonate of ammonia to the ounce, & in 4m 5m  contracted & became thickened in specks or patches; assuming a pale brown colour. When looked at again after 1h 30m this appearance had again somewhat changed. A third specimen was treated with a weaker solution of 1 gr to the ounce, & after 1h the glands had become pale brown, & contained more numerous granules.)

(Four specimens were irrigated with a solution of 1 gr. of nitrate of ammonia. One was examined after 15m & the glands seemed affected; & after 1h 10m there was a great greater change, the white colour protoplasmic case was somewhat shrunk  & included many granules were visible. In another specimen after 2h the utricular protoplasmic layers were was a good deal shrunk & had become brownish. No this can Similar effects were observed in the two other specimen, but which were not observed examined until an interval 21h  had elapsed. In several of these cases the nuclei seemed to have increased in size.  

[29v]

[mathematical notes by George Darwin]