The sections from which the drawings were made are paraffin sections of 
Zenker-fixed tissue stained by the eosin-methylene-blue method of Mallory. 
The drawings were made with the aid of a camera lucida. 
PLATE 1 
EXPLANATION OF FIGURES 
Oil-immersion objective and no. 4 ocular (Leitz). 
1 Monaster showing achromatic spindle in an endothelial cell containing 
carbon in a sinusoid of the liver (dog 209, table 1). 
2 ‘Two monasters (liver dog 209, table 1). 
3 Diaster in capillary of heart muscle (rabbit 138, table 1). Note carbon 
particles in cytoplasm. 
4 Monaster in an endothelial cell of a vessel (portal vein?) in a portal tract 
at a point where the vessel narrows and enters the liver parenchyma (dog 209, 
table 1). 
48 
