XVIU 



Fleas for identification should be sent to the Hon. N. Charles 

 Rothschild, Tring Park, Tring, Herts. 



Fig. 103. Ctenocephalus cams, x 30. (After Railliet) 



LITERATURE 



Taschenberg. Die Flohe. 



C. F. Baker. A revision of American Siphonaptera or fleas, 

 together with a complete list and bibliography of the group. 

 Pvoceedings of the United States National Museuvt, Vol. XXVIII, 

 pp. 365-469, with Plates X-XXVI (No. 1361). 



STAINS, NUMERICAL DATA, ETC. 



Fixing and Hardening Solutions 



Alcohol is a fixative and dehyd;-ating medium, and for 

 ordinary work is the most convenient. The tissues, in small 

 pieces, may be placed directly in methylated spirit (ninety per 

 cent, alcohol), or absolute alcohol (ninety-eight per cent, 

 alcohol). Change the alcohol a few times. Or pass through 

 fifty, seventy-five, ninety-five, one hundred per Cent, alcohols, 

 leaving a few hours in each. After hardening, if the specimens 

 are not to be imbedded immediately, transfer to alcohol of 



