Note 52 — Chapter I

There are several other kinds of bacteria infesting milk, some of which are motile, others non-motile, producing acidity and colouring matter, as B. prodigiosus, red-milk; B. synxanthus, yellow milk; B. lactis aerogens, which are pathogenic; B. lactis albus, which coagulate milk; and another form, which is productive of slimy or ropy-milk.