13Q 
NATURAL HISTORY OF SELBORNE. 
drawn : and, moreover, a lien-turkey, in the same circumstances, 
would sit on in tlie empty nest till she perished with hunger. 
I think the matter might easily he determined whether a 
cuckoo lays one or two eggs, or more, in a season, by opening a 
female during the laying-time. If more than one was come down 
out of the ovary, and advanced to a good size, doubtless then she 
would that spring lay more than one. I will endeavour to get a 
hen, and to examine. 
Your supposition that there may be some natural obstruction 
in singing birds while they are mute, and that when this is re- 
moved the song recommences, is new and bold ; I wish you could 
discover some good grounds for this suspicion. 
I was glad you v^ere pleased with my specimen of the capri- 
mulgus, or fern-owl ; you were, I find, acquainted with the bird 
before. 
When we meet, I shall be glad to have some conversation with 
you concerning the proposal you make of my drawing up an ac- 
count of the animals in this neighbourhood. Your partiality 
towards my small abilities persuades you, I fear, that I am able 
to do more than is in my power : for it is no small undertaking 
for a man unsupported and alone tc begin a natural history from 
his own autopsia ! Though there is endless room for observation 
in the field of nature, which is boundless, yet investigation 
(where a man endeavours to be sure of his facts) can make but 
slow progress ; and all that one could collect in many years v/ould 
go into a very narrow compass. 
Some extracts from your ingenious " Investigations of the 
difference between the present temperature of the air in Italy,^^ 
&c. have fallen in my way ; and gave me great satisfaction : they 
have removed the objections that always arose in my mind when- 
ever I came to the passages which you quote. Surely the judicious 
Virgil, when writing a didactic poem for the region of Italy, 
could never think of describing freezing rivers, unless such se- 
verity of weather pretty frequently occurred ! 
P.S. Swallows appear amidst snov/s and frost. 
LEITER VI. To the Hon. DAINES BARRINGTON, 
DEAR SIR, Selhorne, May 21, 1770. 
The severity and turbulence of last month so interrupted the 
regular progress of summer migration that some of the birds do 
