1. The rate of multiplication of fast-growing micro-organisms is proportional to the number of organisms, and to the concentration of foodstuff.
2. The initial rate of multiplication affords a factor of comparison both of efficiency for media and of reproductive properties of organisms.
3. Vaccines may be prepared in large quantities on the basis that a maximum number of organisms is attained to, this maximum being dependent on the concentration of nutriment, and independent of the amount of culture inoculated.
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