
566 THE AMERICAN NATURALIST. [Vor. XXXVI. 
The prolongation of the nerve just beyond the sense cell 
is of considerable thickness, staining deeply; and abruptly 
after this the nerve extending to the hair is very minute. 
It was impossible to trace the nerves farther than the bases 
of the hairs where whole mounts were made, and Duboscq 
(97 and '98), in Orthoptera and chilopods, traced the nerves only 
this far. However, earlier workers with methylen blue who 
studied simply the surface views represent nerves coming from 
the tips of the hairs; but it seems probable that such figures 
are in large part diagrammatic. Vom Rath found by the Golgi 



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Fic. 5. — Surface vi f I lls f the silkworm (Bombyx mori). 
: Ba f hairs also shown. Methylen blue. 
method cavities of sensory hairs filled with nerves; this result 
is regarded as an artifact by Duboscq, who shows clearly how 
appearances like nerves may be obtained in the cavity of hairs 
due to deposits of chromate of silver; and he shows quite clearly 
that when nothing but the nerve cell and fiber is impregnated 
the nerve fiber stops at the base of the hair, as was apparently 
the case in his methylen blue preparations. 
Retzius ('95), in Astacus, by means of the methylen bluemethod, 
traced the nerve to the base of the hair. This attracted the 

