EXPLANATION OF PLATES 
The figures were made with the aid of the camera lucida. The lenses used 
were: 2-mm. apoch. oil.-immer. obj., comp. ocular no. 8. The figures in plate 1 
are reduced one-half from the original. The figures in plate 2 are reduced only 
very little from the original. 
PLATE 1 
EXPLANATION OF FIGURES 
1 Mature forms of Bacillus radicicola in the cytoplasm of root-nodule cells. 
Bensley’s stain. 
2 Senile forms of Bacillus radicicola in the cytoplasm of root-nodule cells. 
Bensley’s stain. 
3 Juvenile forms of Bacillus radicicola in the cytoplasm of root-nodule cells. 
Bensley’s stain. 
4 Mitochondria in the leaf stem of the white clover. Bensley’s stain. 
5 Mitochondria in a young unfolded leaf of the white clover. Bensley’s stain. 
6 Rabbit pancreas smear after pyronin-methyl green staining. 
7 Rabbit liver smear after pyronin-methyl-green staining. 
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