Chronoscope

[Gr. chronos, and skopein, to observe, to view. An instrument to measure the duration of luminous impre ions on the retina. Chrysalid, ( kris'a - lid ,) a. Pertaining to a chrysalis. Chrys'alid, n. See CHRYSALIS. Chrysalis, (kris'a-lis,) n.; pl . CHRYSALIDES, (kri-sal'edez.) (Lat. chrysalis ; Gr. chrysallis , from chrysos , gold.] ( Zool .) The particular form which butterflies, moths, and some other insects a ume, before they arrive at their winged or perfect state. (See Fig . 538.) It is also called aurelia, from aurum . gold. In this form, the animal is in a state of rest or insensibility: having no organs for taking nourishment, nor wings nor legs. The external covering is cartilaginous, and usually smooth and glo y, sometimes hairy. The name is taken from the yellow color of certain species; but they are of different colors, as green, black, .