. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. UBRAR. METHODS OF ESTIMATING THE EFFECTS OF MELANOPHORE CHANGES ON ANIMAL COLORATION G. H. PARKER (Biological Laboratories, Harvard University, Cambridge) In animal chromatics melanophores have received more attention than any other form of chromatophore. This has been due mainly to the conspicuousness and relative permanence of their pigment and to the consequent ease with which the changes in the disposition of this pigment can be followed. The technique of recording such changes varies more or less with the investigator a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. UBRAR. METHODS OF ESTIMATING THE EFFECTS OF MELANOPHORE CHANGES ON ANIMAL COLORATION G. H. PARKER (Biological Laboratories, Harvard University, Cambridge) In animal chromatics melanophores have received more attention than any other form of chromatophore. This has been due mainly to the conspicuousness and relative permanence of their pigment and to the consequent ease with which the changes in the disposition of this pigment can be followed. The technique of recording such changes varies more or less with the investigator and may well be a subject for critical consideration. Such a consideration is the aim of this paper. The questions herein discussed are well illustrated by the color changes in the catfish, Ameiurus nebulosus, and this fish will be used as an example in much of the present discussion. The older investigators in describing the various color conditions in animals were content to present them in terms of full paleness or full darkness as judged by the observer's eye. It soon became evident, however, that such gross dis- tinctions were insufficient, and attempts were made to divide the color range of any given animal by points that would break it up into reasonable units. Many authors came to employ five such points which separated the whole range into quarters. The points thus used were, in addition to the extremes pale and dark, a middle point termed intermediate and two secondary points pale-intermediate and dark-intermediate in positions appropriate for these designations. In judging by this method of the color condition of a particular fish at any moment it was found desirable to have fixed standard color samples for compari- son. For such a fish as Fundulus these samples were easily made and preserved in formol-alcohol. Fixed samples of this kind are reasonably permanent and may be used with success in determining by ocular comparison the tints of living fishes in process of c
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
