170 FLORA OF PORTUGUESE EAST AFRICA.  [Sess, xx. 
seek further aid. The next large inland bay is at Mambone, 
at the mouth of the Savi river, which flows through a rich 
pastoral country; that excellent fodder grass, Panicwm 
maximum, has become naturalised. The largest bay on the 
coast is some twenty miles further south—Govuro,at the mouth 
of the river of that name. Its area is over thirty thousand 
acres, and almost enclosed by land, leaving a good entrance 
that small vessels can easily enter. The vegetation sur- 
rounding this bay is peculiar, being almost a cover of that 
Queensland tree, the Casuarina equisetifolia, which has 
become naturalised. No doubt the seed has been carried 
by wind or tide from the Zanzibar coast. The promontory 
at the point of this bay is known as Bartholomew Dias. 
The next point of interest on the coast is the Bazaruto 
Islands, under the Lorenzo Marques government. Inham- 
bane is the district north of Lorenzo Marques, and is one of 
considerable agricultural importance. Coffee, sugar, tobacco, 
and cocoanut-palm cover large areas. Minor products are 
largely grown. Petroleum oil springs have lately been 
discovered. 
Since I have been going on giving you geographical notes. 
I will now turn to a few remarks on geological points. The 
present tide-line of the coast is very clearly marked by a 
coral reef running from south to north, and in examining 
the country I find that the high tidal mark reaches another 
reef of degenerated coral. 
All over the low country for twenty miles inland, reefs of 
coral can be traced, generally running from five hundred to 
seven hundred yards distance apart. 
The proper term, I believe, is dead coral stone, for it is 
of little value; wherever it appears on the surface it has 
become solidified from atmospheric action. 
I trust members will forgive me for my introductory notes, 
and not consider that my paper should have been sent to our 
friends in Queen Street, the Royal Scottish Geographical 
Society. Geographical and geological sciences are so con- 
nected with botanical knowledge, that I find it difficult to 
leave them distinet from each other. 
In consulting “ Harvey’s Flora Capensis,” “The Flora of 
Natal,” and the more recent work, not yet completed, “The 
