. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 156 EVENINGS AT THE THE SUCKER OF A BUTTERFLY. A small portion of one half- cylinder. and completeness, is a process dependent on respiration, and connected with the air-pipe that permeates each divi- sion of the sucker.* It will not be a very violent transition if from the sucking- pump of the Butterfly I carry you to the silk-spinner of the Cater- pillar. Here I have a Silkworm in the act of commencing its cocoon; by inclosing which in this glass tu
. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 156 EVENINGS AT THE THE SUCKER OF A BUTTERFLY. A small portion of one half- cylinder. and completeness, is a process dependent on respiration, and connected with the air-pipe that permeates each divi- sion of the sucker.* It will not be a very violent transition if from the sucking- pump of the Butterfly I carry you to the silk-spinner of the Cater- pillar. Here I have a Silkworm in the act of commencing its cocoon; by inclosing which in this glass tube we shall conveniently have the insect at command, and shall be able to view the process under a low magnifying power and reflected light. Now the grey face of the worm is presented to us; and we can see, below the edge of the head-shield, a short broad upper lip, forming two blunt points. Below this is the pair of strong brown mandibles, convex outwardly and concave inwardly, each cut at its broad biting edge into several teeth. Below these are two little points which represent the maxilla, and between them a blunt rounded knob, which is the lower lip {labium). You may also see on each cheek, close to the base of the mandible, a little pit, out of which rises a short columnar organ tipped with two bristles ; these columns are the incipient antenna. Outside them you may dis- cern, on each cheek, a series of six globes of glass (so they appear) set in the substance of the skin,—five forming a semicircle, and one in the centre; these are * Mr. Darwin, in his admirable work On the Fertilisation of Orchids, p. 33 et seq., has shown that the tubular proboscis of Lepidoptera, while used by the insect solely for the collection of nectar, is indirectly and unintentionally used for the transferring of pollen-grains from flower to flower; and thus becomes a most important agent in the pro- pagation of plants. (See his remarkable figure on p. 37 op. oit.). Please note that these image
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Keywords: ., bookce, bookdecade1870, booksubjectmicroscopy, booksubjectzoology
