. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. 51. — Coloniescircular in form, com-posed of radiatingthreads. Fig. 52. — Colonies withopaque centres, with a thinborder fringe. Fig. 53.—Colony showinga network of threads whichis thicker in the centre. full development, some of the colonies become confluent, and some of the feeblerbacteria are checked in their development by the crowding and do not developcolonies. The plate that shows about 100 colonies is chosen, therefore, forcounting. When no one plate is completely satisfactory in numbe
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. 51. — Coloniescircular in form, com-posed of radiatingthreads. Fig. 52. — Colonies withopaque centres, with a thinborder fringe. Fig. 53.—Colony showinga network of threads whichis thicker in the centre. full development, some of the colonies become confluent, and some of the feeblerbacteria are checked in their development by the crowding and do not developcolonies. The plate that shows about 100 colonies is chosen, therefore, forcounting. When no one plate is completely satisfactory in number and even CVLflVAflON OF MICROdRGANISMS llV distribution of the colonies, two of the nearest satisfactory plates are countedand the results averaged. Whenever possible all the colonies on a plate shouldbe counted. Where the colonies are crowded it is necessary to divide the plateinto sections to facilitate counting. This is best done by placing the Petri
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