147 
organism which forms the main part of it, or from the named 
foreign Algæ I am unable to decide. In the former case, viz. the 
cells of the plant being coloured, it would, I think, have to be 
referred to the Lyngbyaceæ (Oscillatoriaceæ), probably to the genus 
Hypheothrix. But the limit between this family and the Thread- 
Bacteria is, in reality, quite vague.” 
The result of Dr. Kolderup Rosenvinge's examination 
seemed to me well worth to be published, this being evidently 
the largest colony of free living Bacteria hitherto made known. 
Ås, however, Dr. Rosenvinge declined to publish it and like- 
wise Dr. Johs. Schmidt, one of the authors of the handbook 
of Bacteriology (Johs. Schmidt & Fr. Weis. Bakterierne, 
1899—1901), declined to do it, I have felt it my duty to publish 
myself a note on this interesting form, though I am otherwise not 
at all familiar with Bacteriology. 
I may venture to give a few supplementary remarks to the 
description given by Dr. Rosenvinge, quoted above. 
The consistence of the jelly is tough, gelatinous, to cut in 
almost exactly like celloidin. — On making a vertical section 
through a colony, one sees that it is distinctly stratified; the layers 
are parallel to the surface, up to half a millimeter thick, though 
mostly somewhat less, and generally more or less irregular.  Be- 
tween the layers there are often imbedded numerous grains of 
sand a. 0. small particles; but the limit between the layers may 
also be quite without foreign particles. 
The stratification, which very much recalls the year-rings of 
trees, must certainly be interpreted as indication of periods of 
growth. During periods of slight growth the sand grains may then 
collect on the surface of the colony and be imbedded into the 
jelly, when growth again goes on. The duration of these periods 
of growth can, of course, only be determined through study of 
the living organism. 
The cell-threads are mainly arranged vertically in the layers, 
but in the limits between the layers they spread more horizontally. 
o= 
