The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . size of the pupil-likeaperture of the pigmental division of each facet, those raysonly which fall upon the centre of each facet, and pass downthe axis of each cylinder, can reach the nervous filaments inthe centre of the eye, and thus there may not be the dis-persion of the rays and consequent indistinctness of visionabove noticed. I submit this opinion with great deference,and^^because it appears to me, that in the various experi-m
The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . size of the pupil-likeaperture of the pigmental division of each facet, those raysonly which fall upon the centre of each facet, and pass downthe axis of each cylinder, can reach the nervous filaments inthe centre of the eye, and thus there may not be the dis-persion of the rays and consequent indistinctness of visionabove noticed. I submit this opinion with great deference,and^^because it appears to me, that in the various experi-ments fmade upon this subject, due allowance has notbeen made for the external circularity of each facet of thecornea. Immediately in connexion with the sense of sight oughtto be noticed that remarkable property which many insectspossess of emitting a peculiar light, and which, as is appre-hended, must be regarded as displayed by insects with a view NERVES—SENSES : SIGHT. 303 to its perception by the eyes of their associates, just as thechirping of a cricket is adduced in favour of the hearing ofits fellows. Amongst insects, the Lampyridoe, or Male and Female Glow-worm. and the ElateridcB, are the only famiUes which are decidedlyproved to possess this faculty, although it has been assertedto prevail in the Fulgorida, and some isolated species of
Size: 2204px × 1133px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookau, bookcentury1800, booksubjectcrustacea, booksubjectinsects
