SCHIZOM YCE TES 



453 



Fig. -^Zy.— Bcggiatoa alba Trev. i, group ot filaments. 2 — 5, filaments of varjnng thickness, 5 

 breaking up ; small dark circles in all cases grams of sulphur : where such are abundant transverse 

 segmentation is indistinct. 6—8, filaments rich in sulphur showing transverse segmentation after 

 treatment wiih solution of methyl violet ; in 8 longitudinal division is shown (formation of cocci or 

 spores). 9, filaments which have broken up into spores. 10, motile spores, (i x 540, other figures 

 X 90Q.) (After Zopf.) 



