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173 
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EXPLANATION OF PLATES. 
Plate VII. 
A photograph of leaf showing the mottled effect; the light spots were 
the yellow areas between the veins. Transmitted light was employed in 
securing this photograph. 
Plate VIII. 
The figures were drawn with the aid of a camera. A one inch ocular 
and 4mm. objective were used in each case. The figures have been reduced 
one-half. Matured tissues of the same age were selected for making the 
drawings. 
Fig. 1. A yellow area showing the cuboidal palisade cells. 
Fig. 2. Section from a healthy leaf. 
Fig. 3. Section from a green area adjoining a yellow spot. 
