Volume VI 
OCTOBER, 1913 
No. 3 
THE ANATOMY OF ARGAS PERSTCUS 
(OKEN 1818 ). 
PART II. 
By L. E ROBINSON, A.R.C.Sc. Bond., 
AND J. DAVIDSON, M.Sc. Liverpool. 
{From the Cooper Laboratory for Economic Research, Watford.) 
(With Plates XIV-XVII and 8 Text-figures.) 
Technique. 
This subject has already been considered in some of its aspects in 
the first part of this paper, but the methods which apply more especially 
to the study of the internal anatomy will now be dealt with. 
For the study of the external forms and the relations of the larger 
organs, dissection with the aid of a dissecting-microscope, using magni¬ 
fications of 10-20 diameters, is necessary. The knowledge derived from 
such dissections is a valuable aid to the interpretation of serial sections 
and is even, at times, indispensable. 
Small shallow glass dishes, filled to a depth of three-eighths of an 
inch or so with paraffin coloured with lamp-black,'are most serviceable 
for the purpose. For fixing the tick in position, a sufficient area of the 
wax is melted by means of a heated wire and, before it solidifies, the 
tick is placed in the melted wax and adjusted for dissection. If just 
removed from alcohol or other fluid, the specimen should first be care¬ 
fully dried with a piece of filter-paper. After the wax has solidified, 
the tick may be more firmly fixed in position by light applications of 
the heated wire round the margins of the body. 
Parasitology vi 
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