NOTES, 
127 
the bight, preparatory to curling the leaf. An hour later a second 
incision, one inch removed from the first, had been completed, a 
similar strand had been spun, and the portion of the leaf between 
the two cuts had been bent partially over. Each strand, fore and 
Figs. 2-5.—Four stages in the formation of a tube-cell or shelter. 
aft, is thickened by continual mouth-weaving; and at the same time 
each in its turn visibly shortens, so that the gradual folding of the 
roof of the shelter can be watched. After another hour the hinder 
t 7(14)09 
