MEMOIRS 



OF 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



No. 6 



THE RAT 



DATA AND REFERENCE TABLES 



FOR 



THE ALBINO RAT 



(MUS NORVEGICUS ALKINUS) 



AND 



THE NORWAY RAT 



(MUS NORVEGICUS) 



— Second Edition — 

 Revised 



COMPILED AND EDITED BY 



HENRY H. DONALDSON 



/ 



PHILADELPHIA 

 1924 





