On Morphological Changes occurring in Bcggiatoa alba. 235 



acid tank, and focused with a Watson Holoscopic condenser 

 N.A. 1-00. 



The stand was by Swift, and the plates used were Barnet 

 Medium Isochromatic, which are well sensitized to wave-lengths 

 passed by the screen and which afford good contrast with gentian- 

 violet stained objects. 



The slides were made from the negatives by contact by Messrs. 

 Flatters and Garnett. 



By infusion is meant strong sewage, allowed to become septic, 

 which has calcium sulphate added and sulphuretted hydrogen 

 blown through at intervals. 



K 2 



