The Action of Plants on a Photographic Plate in the Dark . very interesting one, and is simply obtainedby exposing the paper with the absorbed sap from the leaf to a photographicplate. 390 The Action of Plants on a Photographic Plate in the Dark. Figs. 12 and 13, Plate 21, are from the leaf itself, black currant, and figs. 14and 15 are pictures of the same leaf, but are from the paper between which itwas squeezed. As further illustrating the nature of the pictures obtainableby these processes, fig. 16 shows the front and back of a beech leaf takendirect from the leaf. Ferns and mosses also giv
The Action of Plants on a Photographic Plate in the Dark . very interesting one, and is simply obtainedby exposing the paper with the absorbed sap from the leaf to a photographicplate. 390 The Action of Plants on a Photographic Plate in the Dark. Figs. 12 and 13, Plate 21, are from the leaf itself, black currant, and figs. 14and 15 are pictures of the same leaf, but are from the paper between which itwas squeezed. As further illustrating the nature of the pictures obtainableby these processes, fig. 16 shows the front and back of a beech leaf takendirect from the leaf. Ferns and mosses also give interesting results, butthese will not be dealt with in the present communication. The above investigation has been carried out in the Davy-Faradaylaboratory, and my thanks are due to the managers of the Eoyal Institutionfor the use of their laboratory. I am also much indebted to my assistant,Mr. 0. F. Bloch, who has been of much help to me, and has made all thephotographic pictures for the illustrations. RusselL Roy. Soc, Proc, J5. vol, 78, Plate 6
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