336 



4. Bacillus prodigiosus. albus. 



h\>a linns. 



viscosus. 



albus. 



5- 

 6. 



7- 

 8. 



9- 

 10. 



ii. 



12. 



13. 

 14. 



15- 



auratus. 



hyalinus 



viscosus. 



albus (=7?) 

 albus (=.4?). 



viscosus. 



albus. 

 albus (=5? 



The relation and origin of these variants is given in the following table 



aur. viscosus viscosus hyal. viscosus 



aur. vise, albus 



auratus <- 



V 



viscosus albus 



hyal. viscosus 

 aibus 



prodigiosus normal 



A 



-^ hyalinus 



roseus/ 



roseus 



aur.albus 



albus 



albus hyalinus hyaLelbus 



The upward arrow* denote gain-variation, the horizontal qualitative variation*, the 

 downward arrows loss-variation. Dotted arrows signify that atavism has been observed. 



The two qualitative colour-variants, auratus which is orange-coloured and 

 hyalinus of a deep vine-red, vary in a way quite corresponding to the normal 

 form and like this throw off, under the same circumstances, slime-variants and 

 white variants. Besides, the normal form may return by atavism as well from 

 auratus and hyaltinus themselves as from the variants derived from them. In the 

 pedigree table atavism is indicated by dotted arrows for a few of the cases where 

 it has been staded whit certainty. But there is no doubt that also the other 

 variants are disposed to atavism. 



It should moreover be noted that the auratus- variant approaches, at least in 

 colour, the natural variety Bacillus Kieliensis, but that the latter possesses a stronger 

 power of fermentation, and produces much gas (CO* -|- H2) from maltwort with 

 dextrose or cane-sugar, the former fermenting only dextrose. 



For the rest, B. Kieliensis itself, which varies in a way quite analogous to 

 that of the normal form of prodigiosus here considered, has not yet been ob- 

 tained as a variant from the latter. 



A new character which may rise in addition to the already existing ones, 

 is the production of a large quantity of slime substance by excessive growth of 



