PLATE 4 
EXPLANATION OF FIGURES 
8 Clump of agglutinated blood corpuscles taken from a smear stained with 
erythrosin and toluidin blue. X 1700. 
9 Camera-lucida drawing of plug cells from the cicatrix of a worm killed 
45 minutes after section of the cord. Stained with Hardesty’s method no. 1. 
xX 1700. 
186 
