A

Aug 27th 1874

[Notes on experiments not transcribed]

The secretion though viscid is most easily removed, so that very difficult to leave any object adhering to glands.— Litmus paper coloured as by mineral acid. Leaves linear — many inches in length

B

Aug. 25th 1874. Drosophyllum. —

Secretion intensely acid, far more than in Drosera or Dionæa — It is so on glands not excited — & I find it so on young leaf, with not much secretion & the whole of which leaf had never caught an fly insect).

In this rather young plant — no glands along middle of upper surface of leaf & in some leaves none on a medial line on lower surface —

The lower glands secrete more copiously than upper & flies generally caught towards lower side.

On one leaf on plant in cool-hothouse 8 small insects, chiefly Diptera, 10, on another & 14 on another — & 16 on another

25' 8° 15 put bit of albumen on glands on lower side of almost upright leaf

[165v]

28th 7° 55' bit of free fibrin (close to where point of dead branch sticks) dragged over a few glands & left on side of branch —

10° 25' sodden with secretion — (2° 15' partly dried up; though plant kept under humid Bell-glass.— Must be absorption.—

29th 7° 40' the fibrin now completely liquefied, but the liquid not quite clear, some atoms still suspended in fluid — fluid very acid, as one other drop, in another place; but most of drops absorbed. N. B Probably not only acid, but pepsin already secreted, judging from quickness of action & absorption — It is clear that there is double action — the ready fluid acts & is absorbed & then there is resecretion

C

[Notes on experiments not transcribed]

It is extraordinary difficult to put anything on gland, as the object bit of albumen touched by wet needle withdraws secretion in a drop.

D

Sept 16 7° 50' A.m. Branch with white Thread.

(The glands dried so immediately that must be absorption by substance.) [sketch]

Sept 17th. 7°. 30' glands dry — The cartilage had been soaked & I think cd hardly have absorbed a whole drop— The albumen had just been boiled & was quite damp.

cut off gland & see if discoloured