The theory and practice of infant feeding, with notes on development . #° Fig. 14.—a, Spheres; 6, rods; c, spirals. (Conn.) Classification of Bacteria.—Bacteria are divided ac-cording to their form into three groups: 1. Spherical bacteria—coccus. 2. Rod-shaped bacteria—bacillus and bacterium. 3. Spiral bacteria— Fig. 15 —a, Streptococcus; £•, micrococcus : c, sarcina. (Conn.) Spherical bacteria are further classified according tothe way in which they group themselves .during the proc- BACTERIOLOGY OF MILK. 83 ess of division, as streptococcus, in chains; micrococcus,in irregular mas
The theory and practice of infant feeding, with notes on development . #° Fig. 14.—a, Spheres; 6, rods; c, spirals. (Conn.) Classification of Bacteria.—Bacteria are divided ac-cording to their form into three groups: 1. Spherical bacteria—coccus. 2. Rod-shaped bacteria—bacillus and bacterium. 3. Spiral bacteria— Fig. 15 —a, Streptococcus; £•, micrococcus : c, sarcina. (Conn.) Spherical bacteria are further classified according tothe way in which they group themselves .during the proc- BACTERIOLOGY OF MILK. 83 ess of division, as streptococcus, in chains; micrococcus,in irregular masses, and sarcina, solid masses in groupsof four. 49. Bacteria that grow best in the presence of oxygenor air are called aerobes; those that grow best in the absenceof oxygen or air are called anaerobes. Bacteria whichwill grow only under one of these conditions are calledobligate aerobes or anaerobes, while those species that willgrow either in the presence or absence of oxygen arecalled facultative aerobes or anaerobes. The greaternumber of species of bacteria attack and live upon lifelessorganic matter and are called saprophytes; those speciesthat attack living matter are called parasites. 50. Rate of Growth of Bacteria.—Bacteria increase innumbers at a prodigious rate. If nothing interfered, intwenty-four
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinfants, bookyear1902
