No. 6 



THE RAT 



DATA AND REFERENCE TABLES 



FOR 



THE ALBINO RAT 



(MUS NORVEGICUS ALBINUS) 

 AND 



THE NORWAY RAT 



(MUS NORVEGICUS) 



Second Edition 

 Revised 



COMPILED AND EDITED BY 



HENRY H. DONALDSON 



PHILADELPHIA 

 1924 



