Fic. 2. MiGHoe 
Fia. 4. 
Fig. 2.—Section of a round pellet, x 1o diam. 
Fig. 3.—Section of a spheroidal pellet, x 10 diam. 
Fig. 4.—A portion of the same section as in Fig. 3, x 25 diam. 
Note.—Figs. 2 and 3 are slightly reduced from the size of the 
original photo-micrographs. The original photo-micrograph used for 
Fig. 4 was enlarged in the half-tone from 18% to 25 diam. The neg- 
ative was taken under Obj. 1, Oc. 1 (Winckel). 
