CHAPTER III 



NARCOTISING, KILLING, AND PRESERVATIVE MEDIUMS. PRE- 

 SERVATIVE SOAPS, POWDERS, ETC. MODELLING -COM- 

 POSITIONS, CEMENTS, AND VARIOUS GENERAL FORMULA 



In a number of the formulae which follow, there are certain 

 rules to be observed prior to the actual preservation of the 

 subject, as a whole, in some liquid ; but in many instances it is 

 only necessary to steep it in some medium, which is a sufficient 

 preservative for a certain time. These may be called pre- 

 servatives of the first class, and are to be found in Division 

 I. of this chapter. Others require the removal of the flesh 

 of the subject, so that the skin merely may be preserved, 

 and these are preservatives of the second class, and are to be 

 found in Division II. 



DIVISION I 



NARCOTISING, KILLING, AND PRESERVATIVE MEDIUMS, 

 WITH DIRECTIONS FOR THEIR USE 



Undoubtedly one of the first things to be considered, after 

 having procured a specimen, is the method to be adopted in 

 quickly and efficiently narcotising, killing, or preserving it, as 

 the case may be. Various methods for the treatment of the 

 vertebrata are described hereafter, but the treatment of the 

 invertebrata is quite a different matter, and has been made a 

 special study by many biologists ; but perhaps the most 



