' t*TM/r~ 



MEMOIRS 



OF 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 

 No. 6 



THE RAT 



REFERENCE TABLES AND DATA 



FOR 



THE ALBINO RAT 



(MUS NORVEGICUS ALBINUS) 

 AND 



THE NORWAY RAT 



(MUS NORVEGICUS) 



COMPILED AND EDITED BY 



HENRY H. DONALDSON 





PHILADELPHIA 

 1915 



