Journal of bacteriology . Fig. 47. Fig. 48 (Lawrence and Ford: Aerobic Spore-bearing Non-pathogenic Bacteria) JOURNAL OF BACTERIOLOGY VOL. I PLATE 25 © I Fig. 49 0 g ^ 0 0 ^:f. Fig. 50 (Lawrence and Ford: Aerobic Spore-bearing Non-pathogenic Bacteria) JOURNAL OF BACTERIOLOGY VOL. I PLATE 26 / ^ % 0 l| 0 -*• \ 0 f \ ^ ^ -• o ^ a. \ ft « , ° Fig. 51 \ ^A \ y^; Fig. 52 (Lawrence and Ford: Aerobic Spore-bearing Non-pathogenic Bacteria) THE NUMBER OF COLONIES ALLOWABLE ONSATISFACTORY AGAR PLATES ROBERT S. BREED and W. D. DOTTERRER New York Agricultural Experiment Station, Geneva, New York INTRODUCT
Journal of bacteriology . Fig. 47. Fig. 48 (Lawrence and Ford: Aerobic Spore-bearing Non-pathogenic Bacteria) JOURNAL OF BACTERIOLOGY VOL. I PLATE 25 © I Fig. 49 0 g ^ 0 0 ^:f. Fig. 50 (Lawrence and Ford: Aerobic Spore-bearing Non-pathogenic Bacteria) JOURNAL OF BACTERIOLOGY VOL. I PLATE 26 / ^ % 0 l| 0 -*• \ 0 f \ ^ ^ -• o ^ a. \ ft « , ° Fig. 51 \ ^A \ y^; Fig. 52 (Lawrence and Ford: Aerobic Spore-bearing Non-pathogenic Bacteria) THE NUMBER OF COLONIES ALLOWABLE ONSATISFACTORY AGAR PLATES ROBERT S. BREED and W. D. DOTTERRER New York Agricultural Experiment Station, Geneva, New York INTRODUCTION A point which is of much importance in making bacteriologicalcounts is the hmit in the number of colonies that may be allowedto grow on a plate without introducing serious errors. Probablyevery bacteriological worker has this point in mind in makingcounts and has his own opinion based on experience; but thereare few pubhshed data on the subject. The matter has beenspecially under discussion in connection with the propos
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