All figures are drawn with 
the ABBE Camera and Apochromatie 
Lenses by Zeiss. 
Fig. 1. Transverse section 
of poison lobe. Half schematic 
15/,. ©. D. central duct. 2. V. 
bloodvessel. O. L. outer: stratum 
of capsule. J. Z. inner stratum of 
ditto, 
Fig. 2. Epithelium of cen- 
tral duct from preparation fixed in 
ZENKER’S fluid and stained Bronpr. 
425/,. Ep. 0. epithelium cells. 8. C. 
secreting cells. B. V. blood capil- 
laries, 
fully ripe cells, the centrally situated ectoplasmic cell-membrane has 
entirely vanished and the protoplasmic contents of the cells which now 
empty themselves into the tube consist chiefly of dark-colored, rela- 
tively large granula (Fig. 3). 
The secreting cells have a diameter of 25 to 35 « and the nuclei 
6* 
