scholarly journals IV.—On Some Fossils from Central Africa

1890 ◽  
Vol 7 (12) ◽  
pp. 553-558 ◽  
Author(s):  
T. Rupert Jones
Keyword(s):  
Central Africa ◽  
Tropical Africa ◽  
North West ◽  
The North

In Professor Henry Drummond's “Tropical Africa,” 8vo. London, 1888, pp. 183–199 are occupied with an interesting “Geological Sketch” of the country between the Zambesi River (about 18° S. Lat.) and the Tanganyika plateau (about 3° S. Lat.), his own observations having been made along a route from Kilimane on the coast, to the Shiré, and up that river, by Lake Shirwa and Lake Nyassa, to Karonga (or Karonga's village) on the north west shore near the end of the lake; and thence through the Uchungu district, for about 70 miles, in a part of the Tanganyika plateau.

Burundi

2020 ◽  
Author(s):  
Marius Schneider ◽  
Vanessa Ferguson
Keyword(s):  
Great Lakes ◽  
Central Africa ◽  
Economic Capital ◽  
The Political ◽  
Political Capital ◽  
West Side ◽  
North West ◽  
International Airport ◽  
The North ◽  
Republic Of The Congo

Burundi is a landlocked country in the Great Lakes region where East and Central Africa meet. It is wedged between Tanzania, the Democratic Republic of the Congo (DRC), and Rwanda. It is a small country of 27,834 square kilometres (km) with a population of 10.8 million in 2017, making it the second most densely populated country in Africa. Since February 2019, Burundi has two capitals: Gitega is the political capital of Burundi while Bujumbura is the economic capital. Bujumbura is also the largest city is and hosts the only international airport, the Bujumbura International Airport. The biggest port of the country is situated on the Lake Tanganyika on the north-west side of Bujumbura. The working week is from Monday to Friday and the currency used is the Burundi Franc (BIF).

The Trade between Western Africa and the Atlantic World, 1600–90: Estimates of Trends in Composition and Value

1992 ◽  
Vol 33 (3) ◽  
pp. 369-385 ◽  
Author(s):  
Ernst Van Den Boogaart
Keyword(s):  
Seventeenth Century ◽  
Slave Trade ◽  
Central Africa ◽  
Terms Of Trade ◽  
Gold Coast ◽  
Coastal Regions ◽  
Commodity Trade ◽  
North West ◽  
Western Africa ◽  
The North

Extending the approach of D. Eltis and L. C. Jennings to the seventeenth century, the author takes estimates for the decades 1623–32 and 1680–90 as the starting points for his discussion of trends in the composition and value of the Atlantic imports and exports of Western Africa. Contrary to prevalent opinion, he argues that at least from 1600 onwards the value of slave exports was two to three times higher than that of commodity exports, as measured according to the prices in America and Europe. However, during most of the century more imports were bartered in the commodity trade than in the slave trade, since the trading margin in the latter sector was considerably higher than in the former. The different margins go some way to explaining why the Portuguese concentrated on the slave trade from Angola between 1600 and 1635, which they could carry on with fewer European imports and more effectively protect, while the more efficient Dutch merchants achieved primacy in the competitive commodity trade of West Africa. The different margins also meant a very uneven distribution of imports over coastal regions. Owing to the predominance of Akan gold in the commodity trade, the Gold Coast drew an estimated fifty per cent of all imports at the beginning of the century and still accounted for 34 per cent at the end. Owing to its predominance in the slave trade, West-Central Africa drew 25 per cent of all imports throughout the century. The few available data on the composition of imports suggest that there may have been a shift from metal goods to textiles and a marked increase of Asian textiles and cowries. From 1593 on the Dutch may have initiated a shift in the gross barter terms of trade in favour of the African merchants which spread from the Gold Coast to other areas when the North-west Europeans obtained the major share in the Atlantic slave trade.

SEM and TEM observations of sperm development in the testis of the freshwater fish Oreochromis mossambicus

1990 ◽  
Vol 48 (3) ◽  
pp. 58-59
Author(s):  
Daryl A. Cornish ◽  
George L. Smit
Keyword(s):  
Morphological Characteristics ◽  
Oreochromis Mossambicus ◽  
Breeding Cycle ◽  
Limited Information ◽  
North West ◽  
The North ◽  
Sem And Tem ◽  
Sperm Development ◽  
Ultrastructural Characteristics ◽  
The University

Oreochromis mossambicus is currently receiving much attention as a candidater species for aquaculture programs within Southern Africa. This has stimulated interest in its breeding cycle as well as the morphological characteristics of the gonads. Limited information is available on SEM and TEM observations of the male gonads. It is known that the testis of O. mossambicus is a paired, intra-abdominal structure of the lobular type, although further details of its characteristics are not known. Current investigations have shown that spermatids reach full maturity some two months after the female becomes gravid. Throughout the year, the testes contain spermatids at various stages of development although spermiogenesis appears to be maximal during November when spawning occurs. This paper describes the morphological and ultrastructural characteristics of the testes and spermatids.Specimens of this fish were collected at Syferkuil Dam, 8 km north- west of the University of the North over a twelve month period, sacrificed and the testes excised.

The North West Passage

2014 ◽  
Author(s):  
Roald Amundsen ◽  
Godfred Hansen
Keyword(s):  
North West ◽  
The North
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