Proceedings of the Boston Society of Natural History. 
VoL. 30, No. 2, 
» 
p. 353-374, pi. 1-4. 
THE MEDFORD DIKE AREA. 
By Alfred W. G. Wilson. 
- 
BOSTON: 
PRINTED FOR THE SOCIETY FROM THE 
GURDON SALTONSTALL FUND. 
Decemuee, 1901. 
