190 
Nephrocytes of Pedicuius 
In two cases the nephrocytes were so charged with granules of carmine 
that they began to break up thereby liberating carmine granules which were 
promptly taken up by the leucocytes in the perivisceral cavity. Soon after- 
Fig. 4. Pediculus humanus 24 hours after being injected with ammonia-carmine, showing the 
nephrocytes filled with carmine: d.n., disseminated dorsal nephrocytes; p.n., peri-oesophageal 
or ventral nephrocytes. 
Fig. 5. Dorsal or disseminated nephrocytes linked with the fat body cells, extracted from P. 
humanus after injection with ammonia-carmine: d.n., dorsal nephrocytes; f.b., fat body. 
wards, in all parts of the body, even in the head and legs, were found isolated 
or aggregated leucocytes charged with carmine granules, the appearance being 
identical with that following the injection of a suspension of powdered carmine 
into the body cavity of an insect. 
