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three plants. To this experiment three control plants were kept which remained 
perfectly free from the fungus. 
PERIDERMIUM PINI AND COLEOSPORIUM SENECIONIS. 
Exp. 31.—Two plants of Senecio vulgaris were on the 13th May infected with 
Peridermium pini. On 2nd June the Coleosporium appeared on both plants. 
Exp. 54.—Four plants of Senecio vulgaris were on 7th June infected with 
Peridermium pini. On 28th the Coleosporium appeared. Many plants of 
Senecio vulgaris existed in the garden, but none of them, either at the time these 
experiments were performed, nor before, nor since, have had any trace of the 
fungus upon them. 
