INTliODrCTOKT REMARKS. 7 



" various periods of their existence. "With this view, I fitted up a 

 " large apartment adjoining my residence with breeding-cages and 

 " receptacles for chrysalides. At the commencement of the rainy 

 " season, the period when, in tropical climates, the foliage of 

 " vegetables is renewed, I daily went out in search of caterpillars, 

 " accompanied by the most intelligent of my native assistants. The 

 " caterpillars thus collected were placed in separate breeding-cages, 

 " and several of the assistants were instructed to provide daily, at 

 " regular periods, the food the individuals required, and to secure 

 " the cleanliness of the cages. As soon as the caterpillars were 

 " approaching to perfection, a drawing was made of them. The 

 " same individual which had been submitted to the draughtsman 

 " was then separately confined, watched with the most diligent 

 " care, and as soon as it had passed into the state of a chrysalis, 

 " again made the object of the pencil. A determinate number was 

 " carefully attached to the drawing and to the cage of the chrysalis. 

 " As soon as the perfect insect had appeared and expanded its 

 " wings, it was secured, set, and numbered, in accordance with the 

 " larva and chrysalis. During this period, every possible solicitude 

 " was employed to prevent mistakes. The original series, consisting 

 " of the perfect insects and the chrysalides obtained by this mode 

 " of proceeding, and numbered in accordance with the collection of 

 " drawings made at the same time, is now deposited in the Museum 

 " of the Honourable East-India Company, and afibrds an authentic 

 " document of the accuracy of the details regarding the metamor- 

 " phoses of Javanese Lepidoptera, which will be ofiered in the 

 " course of this work." 



By the method thus described, I obtained the complete history of 

 the transformations of nearly 200 species of Javanese Lepidoptera. 

 The collection varies considerably in the principal divisions of this 

 Order. In the first great division or Tribe, comprising the Diurnal 

 Butterflies, or Papiliones, I have been most successful, and in this 

 tribe my materials are sufiiciently extensive to illustrate the minor 

 Groups or Stirpes into which it has been subdivided ; and in these 

 are included also a large proportion of the Genera found in the 

 tropical countries of the East. 



Having above detailed the advantages I derived from an ac- 

 quaintance with the Wiener Vcrzcichniss, so far as relates to the 

 smaller groups of Lepidoptera, and the association of them into 



