P. H. SCHOUTE. “On fourdimensional nets and their sections by spaces.” (Fourth part). Plate III, 
oy WW 
LZ 
Á 
EZS 
Nd 
VV 
A 
Enk es 
fe DA ¢ 
wil 
SY == 
ee ; | \P G/ 
4 
V/ 
| toceedings Royal Acad. Amsterdam. Vol. Xl. 
