Unger’s Tour in Greece and the Ionian Islands. 79 
comparison would have to be drawn with the Nile above it, which it 
would very nearly equal; for the N ile, with these additions, has scarcely 
doubled its importance, considered as it was seen from above entering the 
Bahr el Ghazal. The Blue River was long assumed to be the Nile only 
because its perennial powers were never tested. It appears to be a moun- 
tain-stream emanating in the country without the rainy zone, but subject 
apart from this feature of the volume of the Blue River, the Nile runs 
ike a sluice in its wonted course; whilst the Blue River, conjoining with 
the Giraffe and Sobat, describes a graceful sweep. The Atbara, which is 
the last, is in all respects like the Blue Nile, only smaller. With one 
White River, the Blue is freely navigated, owing to the great accessions 
of the Giraffe and Sobat Rivers, but below the Blue and Atbara Rivers to 
the sea, the sandbanks obstruct further passage.” 
Uneer’s Screntiric Resutts OF A ToUR IN GREECE AND 
THE Jontan Isutanps.—From the recent work of Prof. Fr, 
Nger, we derive the following epitome of his observations. His 
briéf tour (March 25—June 10, 1860) was confined chiefly to 
ubcea and the Ionian Islands, and the results are contributions 
to their Botany and Geology. He gives 
species of living plants collected by him, four of which being 
new are deacHbat: 
seckera turgida, and Silene Unger’, and with them a new variety 
0! 
and described ten years ago 
kalk) with Tertiary basins in the centre and in the south. The 
highest elevation is in the north, St. Salvator, 2900 feet. 
verai curious natural phenomena are discussed by Unger, 
a8 for instance, that at Argostoli on the west coast of Cephallenia, 
Where the gulf waters flow inland through narrow channels 
of apPearing under the rocks. The force of the water in ed 
_ : 
IM oper 
He supposes it to pass 
