Appendix — 197 — Media for Study 



26. Synthetic lactate medium: 



Glucose 7.4 gm 



KH.PO4 2.38 gm 



K.HPO4.3R.O 5.65 gm 



NH4 lactate 5.4 gm 



iMgS0..7H.O 0.98 gm 



ZnS04.7H.O 11.5mg 



FeSO,.7H.O 11.1 mg 



CuSO. 6.4 mg 



MnCl,.4H.O 7.9 mg 



Distilled water 1000 ml 

 pH 6.95 



27. Potato flugs. 



28. Carrot ^lugs. 



29. Brom-cresol milk: 



Prepared according to formula of Clark and Lubs. Me- 

 dium sterilized by steaming for 20 minutes on three 

 successive days. 



30. Dorset's egg or glycerol egg medium. 



31. Brain-heart infusion with 2 fer cent agar (368). 



A number of other special media are used, either for the growth of organisms 

 or for the production of special substances, notably antibiotics. In several media, 

 the peptone is replaced by casein hydrolysate and the meat extract by various 

 digests of plant residues, such as soy bean meal or by waste products of manufac- 

 turing industries, such as corn steep liquor or by fermentation residues, such as 

 distillery slops. 



