20 DEPOSITS OF PHOSPHATE OF LIME. | bull. 46. 
ticularly indebted for much information and access to a great deal of 
valuable matter contained in his unpublished notes on American and 
foreign phosphatic deposits. 
Injustice to Harvard University it should be said that the following 
report, although designed as a memoir of the U. S. Geological Survey, 
•was used in manuscript form by Dr. Penrose as his thesis for the de- 
gree of doctor of philosophy in that institution. 
(494) 
