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Henry Fox Talbot 
Leaf of a Plant 
[The Pencil of Nature, Part 2, pl. 7] 
1844 (published) 
Hans P. Kraus, Jr., Inc. 
Taken from the reproductions in Larry J. Schaaf, H. Fox Talbot's The Pencil of Nature; Anniversary Facsimile (New York: Hans P. Kraus, Jr. Inc., 1989). The originals selected for this publication were the best single examples available for each plate. Not to be reproduced without permission of H.P. Kraus, Jr. 
Hitherto we have presented to the reader the representations of distant objects, obtained by the use of a Camera Obscura. But the present plate represents an object of its natural size. And this is effected by quite a different and much simpler process, as follows.
A leaf of a plant, or any similar object which is thin and delicate, is laid flat upon a sheet of prepared paper which is moderately sensitive. It is then covered with a glass, which is pressed down tight upon it by means of screws.
This done, it is placed in the sunshine for a few minutes, until the exposed parts of the paper have turned dark brown or nearly black. It is then removed into a shady place, and when the leaf is taken up, it is found to have left its impression or picture on the paper. This image is of a pale brown tint if the leaf is semi-transparent, or it is quite white if the leaf is opaque.
The leaves of plants thus represented in white upon a dark background, make very pleasing pictures, and I shall probably introduce a few specimens of them in the sequel of this work: but the present plate shews one pictured in the contrary manner, viz. dark upon a white ground: or, speaking in the language of photography, it is a positive and not a negative image of it. The change is accomplished by simply repeating the first process. For, that process, as above described, gives a white image on a darkened sheet of paper: this sheet is then taken and washed with a fixing liquid to destroy the sensibility of the paper and fix the image on it.
This done, the paper is dried, and then it is laid upon a second sheet of sensitive paper, being pressed into close contact with it, and placed in the sunshine: this second process is evidently only a repetition of the first. When, finished, the second paper is found to have received an image of a contrary kind to the first; the ground being white, and the image upon it dark.
H. Fox Talbot, The Pencil of Nature, (London: Longman, Brown, Green and Longmans, 1844) 

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Henry Fox Talbot 
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