58C 
thinness which Professor Newton ascribes to the decay and foiling 
oil of the cortex. ° 
Iho countiosm which exampleshavooccurredare, Nottinghamshire, 
Cambridgeshire, Hampshire, Suffolk, Sussex, and Norfolk; and one 
has been obtained at Athlone in Ireland. In Norfolk five, if notseven, 
have occurred. Wo have not the dates of all, but three occurred in 
November, one in December, two in iMarch, and one in April. 
Those dates show that some of the birds had passed through 
more than one moulting period, and that they cannot be all 
young birds, as I at first supposed. Neither are they all of one 
sex; as the two Norwich examples were male and female by 
dissection. These two, though obtained twenty years apart, were 
shot in the same parish, I believe. I may here remark that there 
is nothing to indicate that it is an hereditary variety; though it 
is not unlikely in the case of the Norwich (Nos. 6 and 11 in the 
list given below) and the Sussex examples (Nos. 8 and 10)— the 
