THE INTIMATE STRUCTURE OF THE CELL i8i 



and in lO per cent, sodium chloride. Hinze regarded them as 

 sulphur builders because they resemble the remains which are 

 found after the sulphur droplets have been dissolved out. His 

 conclusion that they are " builders " of sulphur is conjectural 

 (compare the sulphur globules of Thioporphyra volutans). 



Other statements made by Hinze require confirmation, 

 especially where he distinguishes in the cytoplasm a distinct 

 wall which his figures do not show% and where he refers to small 

 bodies embedded in the wall as being chromatin. If this is so 

 it demonstrates the essentially living nature of the membrane. 

 The author (p. 189) has shown that the cilium of Chro- 

 matium Linshaueri is directly connected with the membrane 

 and does not pass through, a fact which is confirmatory of the 

 same conclusion. 



Beggiatoa m IRA bills (Cohn).- 



This organism was described by Cohn (5), by Warming from 

 material found on the Danish coast, and 

 by Engler who found it in the Kiel 

 Canal. It is doubtful whether all three 

 have described the same organism. All 

 describe a species that is relatively very 

 large, for its thickness may reach up to 

 45jU,, and so it is exceptionally favour- 

 able for the study of the intimate 

 structure of the cell. Cohn sketches 

 definite transverse membranes of a 

 typical plant character (Fig. 8c) ; whilst 

 Warming states " j'ai pu alors distin- 

 guer des cloisons avec des interstices 

 de 2-5 a S'S/u,," and depicts threads 

 (Fig. 8 a and b and Fig. 50) in which 

 it appears as though the division 

 of the thread into segments was not 

 effected by transverse walls, but rather 

 by plates of mucilaginous matter such 

 as are observed when segmentation occurs in threads of 





'vd.'o',' 





^---.^v^^' 



^m:^-^ 



Fig. 50. — Beggiatoa 



mirabilis (Warming). 



X 750. 



