SIMILARITIES 341 



Albinos from Vienna, Paris and London, the determinations 

 were made by Donaldson ('12), and ChisoLm ('11) has reported on 

 the relation of body length to body weight in albino and pied 

 rats in London. Chisohn compares his determinations of length 

 with those by Donaldson ('09) and when correction is made for 

 the slight difference in the methods of measurements, the two 

 sets of results agree nicely. 



It is also true that the wild Norways of western Europe seem 

 to be similar to those of the United States (Donaldson, '12 a). 



On the other hand the Hagedoorns ('17) report great differences 

 among the wild Norways in Java, as shown by color, size and skull 

 characters. 



LIFE HISTORY — NORWAY RAT: REFERENCES 



Life History. Crampe, 1884. Donaldson and Hatai, '11. Donaldson, '12. 

 Hagedoorn and Hagedoorn, '17. Lantz, '09. Miller, '11. 



Gestation period. Lantz, '09. Miller, '11. 



Number of litters. Miller, '11. 



Number in litter. Crampe, 1884. Darwin, 1875. King, '23, '24. Lantz, '09, 

 '10. Zuschlag, '03. 



Weight at birth. King, '23. 



Sex ratio. Donaldson, '12. King, '24. Lantz, '09. 



Opening of eyes and suckling. Miller, '11. 



Comparison of Norway with Albino. Crampe, 1884. Darwin, 1883. Donaldson 

 and Hatai, '11. Donaldson, '23. Hatai, '14 a. Jackson and Lowrey, '12. King, 

 '15. Lapicque and Girard, '07. Watson, '07. 



Similarities of Norways and Albinos in western Europe and United Stales. 

 Chisholm, '11. Donaldson, '09, '12, '12 a. Hagedoorn and Hagedoorn, '17. 



