Aug. 21, 1885.] 



♦ KNOW^LEDGE ♦ 



NIGHT SKY FOR AUGUST (Se( 



Showing the heavens as they appear at the following hi 

 it 10 o'clock. I September 3 at 9i o'clock, 



o'clock. I September 7 at 9 o'clock. 



August 30 at 9i o'clock. 



September 11 at SJ o'clock. 



September 15 a 

 September 19 a 

 September 23 a 



door fowls if water is projected forcibly upon it, or if 

 rubbed upon the feathers. I attribute this difference to 

 the dusty condition of the clothing of the cocks and hens. 

 Gilbert Wliite, quoting Ray, says (letter 7) " birds of the 



galHn 



tlu' 



icks and hens, partridges, and phi 

 lis, &!■., iii'c jinlreratrices — such as dust themselves, 

 if cleansing their feathers and ridding 

 n." My own observations show that 

 uains on the sui-fncp of tli,. feathers 

 X piekinn- up a fowl ;,n,l nil.l.in- ils 

 "featli ■ ■ 



dust; each particle of dust hav 

 atmosphere. 



Marine birds, esjiecially those 



8J o'clock. 

 8i o'clock. 

 8 o'clock. 



its own adherent 



to the -wash of 



(as may bo pre 



breast or othei 



those feathers more rcpelh 



Other surfaces to which, ■ 



made thus rcpcllcut of wati 



of , 



clea 



'-drops by coating them with 



p and firmly repellent coating of down 



llirdwicke's Science- 

 her.s are not immersed 



I am treating tliis part of the subject rather more fully 

 than originally intended, as I find that the philosophy of 



