

A-v~-*56to 







IT 18 s 



I 



1. Base of 1908 growth, August. Cedros, irrigated. 



2. Growth of 1908 in April 1909. Cedros, irrigated. 



3. Cortex, 2-year old stem. October 1909. Caopas, irrigated. 



4. Pith of same plant. 



5. Epidermis of an old leaf, field plant, April 1909. 



