Abstract
In a former paper the writer (10) reported experiments which showed that the virus activity of juice expressed from tobacco plants diseased with tobacco mosaic was correlated with the amount of nitrogen supplied to the plants. No conclusions could be drawn from these experiments as to whether this increased activity was due to an increase in the rate of virus multiplication or to some other factor, such as greater accumulation of virus particles over a longer period of time, less destruction of virus, or greater dispersion of aggregates of virus particles. Further studies have now been completed which suggest that the variation in virus activity resulting from a change in nitrogen supply may be brought about by a change in the rate of virus multiplication. Results obtained from several repetitions of the experiments to be described below agree closely with those reported in this paper. Materials and methods
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