230 Macfarlane—The Beach Plum. 
high scientific value of experimental stations for the study of 
plant life. Experiments are now in progress that may aid 
somewhat the solution of these problems. 
EXPLANATION OF PLATES XX, XXI. 
Plate XX. Branch of Beach Plum, belonging to form No. 6. Reduced one- 
fourth. 
Plate XXI. Branch of Beach Plum, belonging to form No. 4. Reduced 
one-half. 
