BACTERIA on 



"Someof the gonidia are filterable. They also produce new bacteria 

 either directly or after having entered the symplastic stage. 



"The life cycle of each species of bacteria studied is composed of 

 several subcycles showing wide morphological and physiological dif- 

 ferences. They are connected with each other by the symplastic stage. 

 Direct changes from one subcycle into another occur, but they are rather 

 rare exceptions. The transformation of spore-free into spore-forming 

 bacteria seems to be dependent on the conditions acting upon the 

 sjnnplasm and regenerative bodies. 



"The discovery of the full Hfe cycles of bacteria may be helpful in 

 many directions. Systematic bacteriology now can be established on a 

 firm experimental basis. Physiological 

 studies will win considerably in con- 

 formity and accuracy when connected 

 with morphological investigations along 

 these new lines. Several problems in 

 general biology are brought under more 

 promising aspects. Agricultural bacteri- 

 ology and medical also will derive much 

 benefit." 



Resekve PK0DUCXS.*-Besides the sUineS" g-I^Sod'^S 

 grains of chromatin which we have just differentiates only the meta- 

 been considering in bacteria are found &f ^^a!*" s-6, 5^.1- 

 other granulations which do not show lus asterosporus. 7, The same, 

 thecharacteristicsof chromatinandwhich 1"^^,'^ ttTmSomatic 

 act as products of nutrition. These corpuscles outside of the spores 

 granulations are characterized by the fr l1/s^HlL^"':alnl 

 reddish color which they assume with lo-ir, Bacillus ahei. 

 most of the aniline blue or violet dyes, as 



well as with hematoxyUn. These bodies, which are common to the 

 majority of the Protista, are metachromatic corpuscles. 



They are foimd in larger or smaller numbers according to the species, 

 the age of the cells, and the medium in which they are living. Some 

 bacteria contain few metachromatic corpuscles {B. radicosus, megathe- 

 rium, mycoides); others produce many (5. akei, asterosporus, Sp. 

 vohttans, Bact. tuberculosis and diphtheria). The metachromatic 

 corpuscles appear at the beginning of development in the form of very 



•Prepared by A. Guilliermond. 



