liar interest that attaches to these pictures changes in direction in any one of these branches can twigs into leaflets, the leaflets into filaments, and so on, with indescribable complexity of detail. Every part doubtless be attributed to local differences of resist- is that they are not… … would be symmetrical in its branchings. But differ- Fig. 8.—SENSITIVE PLATE PLACED BETWEEN ences of resistance in the film would destroy this sym- SHELLACKED PLATES. metry, and render the paths crooked, as is shown in some of the branches of Fig. 1. In some of the figures direct action of the…
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