SMALL MASSES OF ZOOGLCEA 189 



hay infusion. On tlie right side the principal mass of colourless 

 segments may be seen, and some of these took on a brownish-black 

 colour before they began to germinate, as shown in the figure. 

 The heterogenetic Fungus-germs, thus produced, are minute ovoid 

 bodies with one, or sometimes two, nuclear particles, such as may 

 be seen in this case and also in Fig. ii, C and in Fig. 15.' 



From what has already been said, it will be seen that there are 

 various modes in which Fungus-germs originate from the Zoogloea 

 masses. Still, these different modes are only comparatively un- 

 important variations, dependent upon the different states of the 

 Zoogloea masses, in regard to colour and degree of segmentation, 

 at the time when the actual transformations take place. The 

 principal variations seem to be these : — 



(a) Zoogloea entire and uncoloured ; organisation throughout, and 

 Fungus-germs, when forming, becoming brown, as in Figs. 12-14. 



(b) Zoogloea entire, but assuming a brown colour before the 

 transformation into fungus-germs occurs, as in Fig. 11 D, and 

 as shown in Fig. 4 A, in " The Annals and Magazine of Natural 

 History" for February, 1905. 



(c) Zoogloea uncoloured, undergoing partial segmentation, and 

 then the origination therefrom of Fungus-germs gradually becoming 

 brown, as in Figs. 16 and 17. 



(d) Zoogloea uncoloured and undergoing partial segmentation ; 

 these segments then becoming brown, and subsequently being 

 transformed into groups of brown Fungus-germs, as in Fig. 11, A. 



(e) A mixture of the last two processes, as shown to some extent 

 in the lower part of Fig. 17. 



(/) Zoogloea uncoloured and undergoing complete segmentation 

 into colourless units, which gradually assume a brown or brownish- 

 black tint, as in Fig. 18. 



As previously stated, the conversion of the Zoogloea masses 

 into aggregates of Monads takes place less frequently than their 

 transformation into Fungus-germs. Still the two processes may 

 often be seen going on side by side in the pellicle. I am, indeed, 

 disposed to think from what I have seen that some of the same 

 kind of Zoogloea masses which in the early days become converted 

 into Monads may, if they chance to remain untransformed for seven 



' The share taken by the gloeal material in the production of these bodies is 

 referred to in my " Studies in Heterogenesis," p. 82 ; as well as the relations of 

 this gloeal substance to protoplasm. 



