G--Flagella usually present, polar--_PSEUDOMONADACEÆ_ _Pseudomonas_ GG--Flagella when present peritrichic--_BACTERIACEÆ_ H--Parasitic forms showing bi-polar staining. _Pasteurella_ HH--Not as H. I--Strict parasites growing only in presence of hemoglobin _Hemophilus_ II--Not as I. J--Water forms producing red or violet pigment. K--Pigment red _Erythrobacillus_ KK--Pigment violet _Chromobacterium_ JJ--Not as J. K--Plant pathogens _Erwinia_ KK--Not plant pathogens. L--Gram +, forming large amount of acid from carbohydrates, sometimes CO₂, never H _Lactobacillus_ LL--Gram -, forming H as well as CO₂ if gas is produced _Bacterium_ DD--Endospores present--_BACILLACEÆ_ E--Aerobes, rods not swollen at sporulation. _Bacillus_ EE--Anaërobes, rods swollen at sporulation. _Clostridium_ PART II. PHYSIOLOGY. CHAPTER VI. GENERAL CONDITIONS FOR GROWTH. OCCURRENCE.