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Sept. 30'

Aldrovanda Kew

Leaves in whorls— extraordinary like Dionæa — footstalk foliaceous, prolonged into some 6 rather rigid spikes with short spines which apparntly serve to protect the 2 closed lobes of same general shape as in Dionæa. — Externally as lobed leaf — spike & footstalk, papillae & Utricular [sketch], but prolonged. These lobes are far more transparent than in Dionæa—

This edge infolded prolided provided with short curved hooks repeating the spikes of D. Extremity of mid-rib projecting & ending in spine. The surface membrane is not flat, but near the midrib is slightly concave for a space, where the leaf is more opake owing to more chlorophyll.— The broad border flat. On the concave part, many colourless, flat mulberry like glands like those on Dionæa.— Certainly brownish pulpy matter. (perhaps dead flies?) These glands are quite absent on broad broad flat bordering part, & here there are quadrifids like in U. Montana. [sketch] with spikes & arranged cont so as to point to mid-rib—

(These contained much spherical aggregated— transparent matter, but it was rather an old leaf.) which did not undergo change of form from irrigation with C. of Amm 2 gr. to 1 oz.

There are long multicellular, in more than 1 row on midrib & a few over concave part. These resemble closely except in being longer the filaments of D. & as Cohn remarks probably serve same purpose.— In about middle of each there are some short & square cells & here the spine can is often bent, & is evidently analogous to joint at base of filament of

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Aldrovanda

D. but has not close to base, owing to concavity & the spine rising close to midrib, so not so liable to be bent as in D. where they arise near middle of lobe. Oct 2d Spikes rigid — protect leaf from the outside — Marginal spines straight. I think sensitive filaments but basal articulation.

Glands coarse, — short footstalks of 2 rows of cells.

Oct. 2d 8° 20' (Urea 1 gr. to 1 oz) quadrifids (& 2 or 3 trifids) near round end of leaf— almost clear — one with 2 balls. —

Glands outer cells clear.

12° no difference

Oct. 3d 8° 20'. no clear difference in Glands, but in quadrifids (several trifids) utricular layer in some a little shrunk with yellowish specks, just as in Utricularia — & several with good-sized spheres or small ones — I have no doubt have absorbed. — All in infolded spires on margin — minute shiny spheres.

(The margin of leaf is much infolded & the spires which look like those on Broccoli are flexible & can be bent & undented easily & doubled over without fracture — In this same Urea spec protoplasmic layer here & there contracted into masses, with some little spheres more or less aggregated & irregular little masses of protoplasm [sketch] spines

Oct 2. 8° 4° Valve with fresh infusion of raw meat on best piece the border cells of gland quite clear, almost so on other piece. — quadrifids rather shrunk from injury — some few clear.

12° no difference

Oct 3d. 8° A.m. sphere, (formed I think by aggregation of utricle & all contents) in many of the circumferential cells of many of glands; I do not doubt absorption. In quadrifids utricular layer much shrunk, but I cannot say whether more than before. Marginal spines with little spheres & utricles shrunk, are these really still spines.!!!

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Quadrifids variable— I have seen one bifid [sketch] — arms variable in length

Marginal spines not homologues nor same function as spikes of Dionæa

(Oct 19. Frank observed 3 leaves of Aldrovanda & found margin turned inwards on both sides in all 3.—)