PLATE XXXIX 
Series of cultures 9 days old obtained in the test of bird No. 23, a brown creeper. 
Each Petri dish of the first series (first row) contained 1/10,000 of the water in which 
the bird was washed; each of the second series (middle row), 1/45,000; and each of 
the third series (third row), only 1/90,000. 
