Harper's new monthly magazine, 41 / 1870
Much interest was excited some years since by the result of certain experiments instituted in Paris upon the larva of a Mexican salamander, which laid eggs while still in the immature condition, these eggs hatching out in the water, and ultimately developing into the perfect salamander form. The progeny of this salamander tadpole has been distributed since that time over Europe, and there are few collections of any importance without specimens, either in alcohol or living. In experiments upon breeding these salamanders it was found that when reared under orange-colored glass they were bleached exactly as if they had been kept in the dark - this appearance (due to the absence of pigment in the cellules of the skin) contrasting very remarkably with the dark gray tint of those reared in vessels of transparent glass. The bleaching in question is supposed to be due to the absence of blue, violet, and ultra violet rays of the spectrum, which are absorbed in passing through the glass.