[54.1]

[Letter not transcribed]

[54.2]

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[54.2v]

2

(Ch. 7)

My chief object in this chapter is to show how powerfully is the influence of the salts of ammonia in causing act on the leaves of Drosera to become inflected, and more especially to show what extraordinarily small amounts suffice suffice to excite inflection. I shall therefore be compelled to enter into details minute full details. Doubly distilled water was always used, and with in the more delicate experiments with phosphate of ammonia, I used water given me by Prof. Frankland, which had been prepared with the most utmost possible care; was used. The graduated measures were tested, and found as accurate as such measures can be. The salts were carefully weighed; & in all the more delicate experiments, by Borda's double method. But extreme accuracy would have been superfluous, as the leaves differ so greatly in irritability, according to their age, condition and or & constitution. Even the tentacles on the same leaf differ in the same manner irritability to a marked degree. The experiments were tried in different the

[in another hand:] 1877 Galton

[Insectivorous plants, p. 136: "THE chief object in this chapter is to show how powerfully the salts of ammonia act on the leaves of Drosera, and more especially to show what an extraordinarily small quantity suffices to excite inflection. I shall, therefore, be compelled to enter into full details. Doubly distilled water was always used; and for the more delicate experiments, water which had been prepared with the utmost possible care was given me by Professor Frankland. The graduated measures were tested, and found as accurate as such measures can be. The salts were carefully weighed, and in all the more delicate experiments, by Borda's double method. But extreme accuracy would have been superfluous, as the leaves differ greatly in irritability, according to age, condition, and constitution. Even the tentacles on the same leaf differ in irritability to a marked degree. My experiments were tried in the following several ways."]

[54.3]

[Letter not transcribed]

[54.3v]

11 870

Chap. XVIII

hook of the tarsus of some animal. An Also an elongated greatly decayed animal. And lastly a curious flask-shaped organism, having the walls formed of rounded cells.

In this bladder, as well as in several others, there were some unicellular algæ, and one multicellular alga, which no doubt had lived as intruders.

Porter/ The second bladder contained an Acarus having all with its eight legs preserved, and much less decayed than the former one; as well as remnants of several other articulate animals. The third contained the end of the abdomen with the two terminal hinder limbs of, as I believe, an Acarus. The fourth contained remnants of a distinctly articulated, bristly animal, and of several other organisms, as well as much dark brown organic matters, the, nature of which could not be made out.

Some bladders from a plant, which had lived as an epiphyte in Trinidad in the W. Indies, were next examined, but not so carefully as before; nor had they been soaked long enough. Four of these bladders contained

[Insectivorous plants, p. 437: "hook of the tarsus of some animal; also an elongated greatly decayed animal; and lastly, a curious flask-shaped organism, having the walls formed of rounded cells. Professor Claus has looked at this latter organism, and thinks that it is the shell of a rhizopod, probably one of the Arcellidae. In this bladder, as well as in several others, there were some unicellular Algae, and one multicellular Alga, which no doubt had lived as intruders.
A second bladder contained an Acarus much less decayed than the former one, with its eight legs preserved; as well as remnants of several other articulate animals. A third bladder contained the end of the abdomen with the two hinder limbs of an Acarus, as I believe. A fourth contained remnants of a distinctly articulated bristly animal, and of several other organisms, as well as much dark brown organic matter, the nature of which could not be made out.
Some bladders from a plant, which had lived as an epiphyte in Trinidad, in the West Indies, were next examined, but not so carefully as the others; nor had they been soaked long enough. Four of them contained much brown, translucent, granular matter, apparently organic, but with no distinguishable parts."]

[54.4]

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[54.5]

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[54.5v]

[text excised] much decayed contents could not be distinguished from having been long dried and pressed, their nature could not be distinguished. A considerable number of Several bladders on a plant which had grown in black earth in New Granada were first examined; and four of these included numerous remnants of distinct many animals. The first contained a hairy Acarus, so much decayed that nothing was left except its transparent coat. A Also a yellow chitinous head of some animal with an internal fork, to which the œsophagus was suspended; but I could see no mandibles. Also the double

[Insectivorous plants, pp. 436-7: "I did not at first find out that it was advisable to soak the rhizomes for two or three days, and that it was necessary to open the bladders and spread out their contents on glass; as from their state of decay and from having been dried and pressed, their nature could not otherwise be well distinguished. Several bladders on a plant which had grown in black earth in New Granada were first examined; and four of these included remnants of animals. The first contained a hairy Acarus, so much decayed that nothing was left except its transparent coat; also a yellow chitinous head of some animal with an internal fork, to which the oesophagus was suspended, but I could see no mandibles; also the double hook of the tarsus of some animal; also an elongated greatly decayed animal; and lastly, a curious flask-shaped organism, having the walls formed of rounded cells."]