A PHYSIOLO^^IC iL STUDY OF THE CLII.TA-^IO 

 CONDITIONS OF MARYLAND AS I.fEASUHSD BY PLAN'^ ^^OW^H. 



( A second contribution from data obtai nad 

 under the auspices of the Maryland State 

 'leather Service, in 1914.) 



DISSERTA-^ION 



Submitted to the Board of University Studies of the 

 Johns Hopkins University in conformity with 

 the requirements for the degree of 

 Doctor of Philosophy. 



By 

 F. Merrill Hildebrandt 



M 



Bartimore , June , 1917* 



