25 



prevalent when this century was young. I allude to the 

 instance I had in mind when I gave the advice mentioned at 

 the commencement of this note ; namely, to the collection of 

 Metamorphoses of the Lepidoptera of Java made hy the late 

 Dr. Horsfield between the years 1813 to 1819, one of the 

 most extensive on record, yet falling short of 200 species. 

 (See Cixtalngue of the Lepidoptcrous Insects in the Museum 

 of the Hon. East India Company. By Thomas Horsfield, 

 M. and Ph.D., F.R.S., and Frederic Moore. Vols. 1 and 2, 

 1857-9. London, Wm. H. Allen & Co., wherein a large 

 number of these metamorphoses are figured and described.) 



Dr. Horsfield records in his " Catalogue " how he fitted up 

 a large apartment adjoining his residence with breeding-cages 

 and receptacles for chrysalides ; how he went out daily in 

 search of caterpillars, accompanied by his most intelligent 

 native assistants, several of whom were told off" to provide 

 suitable daily food, to watch the caterpillars and their 

 changes, and to submit them in due time and season to the 

 draughtsman. He also relates the elaborate means taken to 

 secure the identity of each individual through all its varied 

 changes. Equal labour and care was in every instance 

 required in reference to the present collection, and all had to 

 be done by the author single-handed. To testify that it has 

 been done with the utmost care and exactness is my bounden 

 duty. 



It remains only to state that the larva, pupa, and imago of 

 a species when worked out was indicated by the same 

 Roman numeral ; that a separate sheet of paper was devoted 

 to each species and bore the same number ; this in the order 

 in which the species was worked out, and having no reference 

 to ultimate scientific arrangement. The critical determina- 

 tion of the species has, at the recommendation of the Rev. 

 H. H. Higgins, been intrusted by the Library and Museum 

 Committee to my brother, who strongly recommends that 



