It could be transmitted indefinitely; he determined the best temperature for it and found that it did not propagate on dead staphylococcus.
When he was sure that the X Principle did reproduce itself indefinitely, so that in the tenth tube it grew to have as much effect as in the first, then he solemnly called on Gottlieb and laid before him his results, with his plans for further investigation.
He tried, elaborately, with many flasks and many reseedings, to determine whether the X Principle would perpetuate itself indefinitely, whether when it was transmitted from tube to new tube of bacteria it would reappear, whether, growing by cell-division automatically, it was veritably a germ, a sub-germ infecting germs.
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I need a deadline. This can not go on indefinitely.