ON THE EXPLORATION OF KILIMA-NJARO. 685 
f tensive and numerous to justify us in assuming that the upper part of 
_ the Kilima-njaro massif chiefly consists of one or the other of these two 
allied groups of rocks ; the only point of special interest in them being the 
abundant occurrence of this peculiar variety of orthoclase. 
A fragment of a crystal, found in ‘Stream Valley’ at about 8,000 feet 
on Kilima-njaro, ‘ much coveted by the ratives for ornaments, and said to 
be found only after heavy rains,’ is simply rock-crystal (quartz). This 
mineral appears to indicate the presence of more siliceous rocks than the 
above; not improbably of either granite, gneiss, or some kind of schist. 
P.S.—While the above description was in the press, another speci- 
men reached me, which had previously been mislaid. It is labelled 
‘Found in a stream valley on Kilima-njaro,’ and is a fragment, smoothed 
on all sides but one, of a black lava, in most parts very vesicular, the 
longest diameter being about 34 inches. It is evidently either a rather 
basic augite-andesite glass or a basalt glass; probably the former, like 
other specimens described above. 
Report of the Committee, consisting of Mr. Joan Cordeaux (Secre- 
tary), Professor A. Newton, Mr. J. A. Harvie-Brown, Mr. 
WILLIAM EAGLE CLARKE, Mr. R. M. Barrinaton, and Mr. A. G. 
Morg, appointed for the purpose of obtaining (with the con- 
sent of the Master and Brethren of the Trinity House and 
the Commissioners of Northern and Irish Lights) observations 
on the Migration of Birds at Lighthouses and Lightvessels, and 
of reporting on the same. 
Tae General Report! of the Committee, of which this is an abstract, 
forms a thick pamphlet of 186 pages, and comprises observations taken 
at lighthouses and lightvessels, as well as at several land stations, on 
the coasts of Great Britain and Ireland, and the outlying islands; also 
from Heligoland, two stations in the Baltic, the Faroe Islands, and Iceland. 
Independent notes and observations have also been received from several 
ocean steamships in the Atlantic and Polar seas. 
Altogether 193 stations have been supplied with printed schedules for 
registering observations, and returns have been sent in from 118. The 
number of schedules returned from each station varies considerably, and 
is in some degree dependent on the interest taken in the subject by the 
observers, but chiefly perhaps on the position of the station being fayour- 
__ ably or otherwise situated for observation. 
The usual number of schedules returned from a station is one or two; 
in many cases this is greatly exceeded. The Pentland Skerries, Isle of 
May, and Inner Farn Island lighthouses, have sent in fourteen, twelve, 
and nine respectively. The total number of schedules returned is greatly 
in excess of previous years, and the labour of arranging, tabulating, and 
reporting thereon has been considerably increased. 
The Committee have this year added a new feature to their report in 
an outline map of the British Isles, showing the stations, marked in red. 
This map has been prepared by Messrs. McFarlane and Erskine, of Edin- 
* Report on the Migration of Birds in the Spring and Autumn of 1884. West, 
Newman, & Co., 54 Hatton Garden, London, E.C. 
