82 Descriptions of Preparations. 



period of quiescence^ makes the method of their disappearance 

 easily intelligible. 



A monograph of great merit and detail has been written upon the 

 anatomy of the larva of the Goat Moth, by P. Lyonet, Traite 

 Anatomique de la Chenille qui rouge le bois de Saule, 1762, 

 in which excellent figures will be found of the digestive system 

 in pi. V. xiii. xviii., of the respiratory in pi. x. xi., of the mus- 

 cular in pi. vi. vii. viii., of the ganglia frontalia of the azygos 

 stomato-gastric system, pi. xviii., for which see also Brandt, 

 Ann. Sci. Nat., Ser. ii,, tom. v., 1836, p. 99. 



For the sources for the production of fat within the animaFs body, 

 see Voit, Zeitschrift fiir Biologic, Bd. v., Hft. i., p. 79, 1869. 



For the development of the 'fat body^ in Lepidoptera, see Hermann 

 Meyer, Zeitschrift fiir Wissenschaftliche Zoologie, i. 175. 



For the absorption of it in the processes of growth and develop- 

 ment, especially of the reproductive organs, see Peters, Carus, 

 and Gerstaecker, Handbuch der Zoologie, p. 120, and Weis- 

 mann. Die Entwickelung der Dipteren, p. 178. 



For the changes of consistence observable in the tissues and organs 

 of the Lepidopterous pupa, see Newport, Phil. Trans., 1832, 

 p. 390 ; and for the much more extensive changes in the way 

 of histolysis which appear to furnish an instance of ' free cell- 

 formation^ on the one hand, and on the other to approximate 

 the character of the metamorphosis of the coarctate dipterous 

 pupae to that of ' alternation of generations,^ see Weismann, 

 1. c, pp. 135, 164, 176, 231, 232, 239. 



For the respiration and temperature of insects, see Newport, Phil. 

 Trans., 1836, 1837. 



29. Larva of Privet Hawk Moth {Sphinx Ligustri), 



Dissected so as to show its nervous system. 



The dorsal integuments and the various organs of vegetative 

 life have been removed; a black bristle has been passed through 

 the nerve collar, and slips of blue paper placed under various parts 

 of the chain of ventral ganglia. In the nerve system as thus ex- 



