Letters, Extracts, and Notes. 
7 19 
also tell us what influence age has upon plumage, &c.; 
where a young bird, the birthplace of which is known, breeds ; 
whether individuals return to previous nesting-haunts, and 
whether pairs come together again in successive breeding- 
seasons. 
Many of the readers of ‘ British Birds 5 are taking 
the matter up, and it is expected that a large number 
of birds of all kinds will be “ ringed.” The rings are 
extremely light and do not in any way interfere with the 
bird's power of flight: all are stamped u Witherby, High 
Holborn, London,” and bear a distinctive number, which 
in the smaller sizes is stamped inside the ring. It is 
hoped that anyone into whose hands a bird so marked 
should fall will send the bird and the ring (or, if this be not 
possible, then the particulars of the number on the ring, the 
species of bird, and the locality and date of capture) to the 
address above given. 
The Lake-N’garni Expedition. — Two members of the 
Ruwenzori Expedition (Mr. R. B. Woosnam and the Horn 
Gerald Legge) are again in Africa, exploring the little-known 
country round Lake N'gami. Information of their safe 
arrival on the 27th of June last at the shores of that lake 
has been received in a long and interesting letter written to 
Mr. Ogilvie-Grant, but they had a difficult task to get there. 
They were twice obliged to cross stretches of 120 miles 
without water, and the oxen and horses were forced to live 
entirely on sama, a little white water-melon, which was 
also boiled down in order to cook meat and to make tea. 
Leaving the railway at Yryburg, in Bechuana-land, they 
travelled due north through the heart of the Kalahari 
Desert. Crossing the Molopo River in April, they found it 
still held a little water, but were told that it would be entirely 
dry by August. Thence they struck slightly east, to a place 
called Kakia, just north of the 25th parallel, and passing 
Kokong, Okwa, and Ghansis, reached Tsau (or Tsao) on 
