Sibyl T. Jbwson and F. Tattersfibld 



233 



Table IX. 

 Toxicity of Pyridine to Aspergillus niger. 



Series III. Culture medium Coons' double strength 200 c.c. 



Pure Pyridine (S.G. = 982) added from capillary pipette. 

 Culture and organism Aspergillus niger from Lister Inst. No. 594. Subculture on Coons' 



agar. 

 Age of culture 20 days. Inoculated in r> c.c. sterile water. 

 Time of incubation 21 days. 

 Temperature of incubation 18°-19° C 



* Determined after neutralisation of Pyridine by acid and allowing fungus to grow 

 a further three weeks. 



* Controls gave a precipitate with Iodine in Potass. Iodide equal to ^0025 per cent. 

 Pyridine. This was allowed for. 



