. Biology in America. Biology. 354 Biology in America sustain roufjlily llircc times the pressure on the foundations of the Woohvorfli Building or the Metropolitan Life. To withstand such a pressure tlie body of an animal would have to be surrounded by an exceedingly strong shell, or else it must be of such a character that the pressure is easily ren- dered the same Avithin and without. The latter method is the one Avhich Nature has adopted, and the bodies of deep sea animals are so soft and permeable that they lose their. Deep Sea Fishes as Seen Against a Light Background. Photograph of a gro
. Biology in America. Biology. 354 Biology in America sustain roufjlily llircc times the pressure on the foundations of the Woohvorfli Building or the Metropolitan Life. To withstand such a pressure tlie body of an animal would have to be surrounded by an exceedingly strong shell, or else it must be of such a character that the pressure is easily ren- dered the same Avithin and without. The latter method is the one Avhich Nature has adopted, and the bodies of deep sea animals are so soft and permeable that they lose their. Deep Sea Fishes as Seen Against a Light Background. Photograph of a group in the American Museum of Natural History in New York. Courtesy of the Museum. are shape very easily when brought to the surface and consequently hard to preserve in their natural form. Below depths of three thousand feet light is virtually absent in the sea. Animals therefore living below this comparatively shallow depth are in perpetual darkness, save for such light as they themselves generate. Many of these deep sea forms carry their own lanterns about w'itli them in the form of phosphorescent organs. The firefly is an object of common experience to many a country dweller, but only the ocean voyager or the inhabitant of its shores, who has seen the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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