K. K. riRKKN 99 



Sonio " snipe-points " (tlio toiininiil fpathor of m snipo's winfi;) 

 mounted in small porenpine (niills. 



Settinij: lUMMJlos. 'rh(\s(^ should he the smallest and finest obtainal)le, 



A small (narrow) s(>ction lifter. A piece of stout silver wii'e. ham- 

 mered flat at one end and turncMl u]) at a sli<i:ht anj^le, serves the ])uipose 

 admiiahly. 



Evaporating dishes (2i in. diam.). 



Several flat-bottomed watch glasses. 



Short test-tubes (1 in. diam.). 



Excavated glass blocks. These may take the place of the watch 

 glasses, as they are most useful for the reception of such reagents as 

 oil of cloves, distilled water and various strengths of alcohol, in which 

 the objects have to be steeped for various periods. They will stand 

 steady on the stage of the dissecting microscope. 



Glass pipettes with rubber teats. 



A small glass table, with a mirror below, is of great convenience 

 when transferring objects from one medium to another. 



The following reagents will be required : 



A strong solution of potassium hydrate (liquor potassac). 



Alcohol, 70 %, 90 %, and absolute. 



Fuchsin (acid), strong aqueous solution. 



Picric acid, saturated solutioii in alcohol. 



Glycerin, dilute. 



Oil of cloves. 



Canada balsam, dissolved in xylol. 



Distilled water. 



3. Preparafiof} and Movnfing of Speciwp-ns. 



Coccidae do not necessarily require any prolonged process of pre- 

 liminary preparation. They may be treated in the fresh condition 

 without any difficulty. On the other hand, material that has been 

 kept in alcohol or other liquid preservatives, or that has remained dry 

 for many years, will respond to treatment with complete success — pro- 

 vided that it has not been allowed to become mite-eaten or infested with 

 fungus. 



Naked species, such as Leccmium, are the simplest subjects and may 

 be best utilised to illustrate the process. The general procedure is the 

 same for all Coccidae ; but slight modifications (to be noticed later) 

 will be necessary in particular cases. 



