122 



MICROBES AND TOXINS 



during speech or coughing (Fliigge). Water-supplies convey 

 the cholera vibrio and the typhoid bacillus. Along with garden 



nwi'vs 





mzrwxe algcB 

 (iOoddoreUa) 



inn/racfiU vaawle 



Fig. 40. — Amoeba Amoeba viriais). Fig. 41. — An amoeba dying full 



(After Gruber.) of parasites. 



cltytiidium 



Sphaereptuya 

 B ^iwyv ■• 'Misapplying itself 

 i /■ ''^u^^m'tolhe infusorian 



Iwa parasitic 

 splmewpTuya 



Fig. 42. — Green euglena enclosing Fig. 43. — Infusorian .ittacUed by 

 a chytridium (lower fungus). acinetian parasites (Spharo- 



(MetchniUoff.) phrya). (Metchnikoff.) 



earth the tetanus spore may gain access to a wound ; the soil 

 may spread anthrax spores over sheep pastures. The foods 

 which are eaten raw (milk, meat, vegetables) convey what they 

 have gathered frpm the soil or from the bodies of animals. 



