SO HENRY H. DONALDSON 
BODY LENGTHmm. 
2505 
250 
240 240 
| 230 
220+ STANDARD CURVE 9 STANDARD CURVE 4220 
An a ae ALBINO oi 
200} i 200 
190 
180 
170 
160 
150 
140 
CHART 1. 130 
ee BODY WEIGHT ems. 
60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 
Chart 1, giving the body length in millimeters for each of the three European 
Norway series separately in relation to the standard curve for the body length of 
the Philadelphia Norways. Also giving the*body length for the three European 
albino series combined, in relation to the standard curve for the body length of the 
Philadelphia Albinos. Norways: © = Paris series, & = London series, V = 
Vienna series. Albinos: X = European series (combined). 
European series and the standards is close. Hence we conclude 
that in body form, the European Norways are similar to one 
another and to the Philadelphia standard, and that the same rela- 
tions are true for the European and Philadelphia Albinos. 
Since the completion of this manuscript, a paper by Chisolm 
(11) has appeared in which he compares the body length of tame 
albino and piebald rats of London with those of the Philadelphia 
Albinos as given by me in an earlier paper (Donaldson, ’09). 
Chisolm’s measurements agree with mine very well up to about 
100 grams of body weight and from there on fall steadily below 
the Philadelphia records with a maximum deficiency of about 5 
per cent. It seems probable however that this difference is mainly 
due to the difference in the method of taking the body length. 
