Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 761
Shape of the flame of the high intensity searchlight arc. 75^ Enoch Karrer. [J- F-1- of our principle. I have observed this species rather closely inthis regard. The hawkmoth has rather elongated wings, w^iththickened front edges; the area of the wing surface comparedwith the weight of the body… … Mercury Surface Shape of the tungsten arc flame. is certainly most strikingly adapted, as shown in Fig. 22. The assumption of the stream-line shape by organisms whereproper conditions exist may be looked upon in the same light asthe adjustment of organisms under a field of force as that ofgravity…
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