148 



THE ACTINOMYCETES, VOL. Ill 



13. 245 and 380 in methanol 



14. 248 and 308 in 70 per cent ethanol at pH 7.5 



15. 250 and 320 



16. 257.5 and 390 to 402 in pH 0.0 phosphate buffer 



17. 262 and 364 



18. 265 and 362 in methanol 



19. 265 and 420 



20. 267 and 281 



21. 270 and 330 to 340 



22. 270 and 370 



23. 281 to 283 and 342 to 344 in methanol 



24. 288 and 460 in ethanol 



25. 290 and 330 at pH 1 or () 



26. 498 and 532 in n-bntanol 



streptonigrin 



novobiocin 



nitrosporin 



xanthothricin 



rnticin 



griseolutein A 



grisein 



mycomycin 



pleomycin 



oxytetracycline 



griseolutein B 



xanthomycin A 



xanthomycin B 



\'iolarin 



C. Antibiotics for which three maxima of light absorption ha\'e been reported 



mitomycin A and B 

 mitomycin C 

 antibiotic X 340 

 bromtetracycline 

 antibiotic 7, 080 R. ; 

 chlortetracycline 

 fervenulin 



1. 215, 316 to 318, and 530 in water 



2. 216, 360, and 560 



3. 218, 289, and 370 in ethanol 



4. 227, 260, and 370 in 0.1 .V HCl 



5. 227, 271, and 304 



6. 230, 275, and 367.5 in water 



7. 239, 270 to 280, and 340 in pH 7.8 phosphate 

 buffer 



8. 240, 278, and 384 in 0.1 .¥ HCl cyanomycin 



9. 248, 312, and 388 aureothricin 



10. 250, 303, and 390 in ethanol holomycin 



11. 250, 311, and 388 in ethanol thiolutin 



12. 288, 301, and 316, tetraene tennecetin 



13. 292, 308, and 320, tetraene endomycin A 



14. 320, 415, and 490 in n-butanol rubidin 



15. 338, 359, and 380, hexaene endomycin B 



D. Antibiotics for which four maxima of light absorption ha\'e been reported 



1. 207, 237, 286, and 343 mitomycin fraction Y 



2. 222, 266, 286, and 369 in methanol nybomycin 



3. 228, 258, 288, and 427 aklavin 



4. 235, 269, 298.5, and 365 in methanol tetracycline 



5. 240, 255, 305, and 375 albofungin 



E. Antibiotics which exhibit either only end-absorption of ultraviolet light, or no 

 typical light absorption, or for which no light-absorption data have been reported 



1. Red substances 



2. Indicator; red in alkaline solution, yellow in 

 acid solution 



3. Yellow substances 



a. Acidic 



b. Basic, water-insoluble 



antibiotic of Chandrasekhar 

 cladomycin 



nocardorubin 



antibiotic of Rolland 

 raisnomycin 



