II.—On Certain Borings in Manitoba and the North-west Territory. By George M. Dawson, D.SC, A.E.S.M., F.G.S. [From the Transactions of the Royal Society of Canada, vol. iv. 1886.] Montreal, 1887.

The late Mr H. T. M. Witham read in 1830 to this Society, and published three years afterwards in greater extension, an inquiry of much interest respecting two fossil trees found in Craigleith Quarry, a mile and a half from the north-west outskirts of Edinburgh. The general points of this inquiry are, that trees of very great size lie, completely fossilised, in the very compact sandstone of the quarry, at a great depth below the rock surface, slightly inclined to the-dip of the strata, with their structure so finely preserved in the fossilising material as to be beautifully shown before the microscope, and recognised as that of the Pinaceous Family, and of the section to which belongs the existing Araucaria. These trees have been generally known to fossile botanists by the name of Araucarioxylon Withami. An opportunity having occurred this year of confirming and extending the inquiries of Witham, it has been thought right to take advantage of it, again through the medium of the Royal Society.

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XXI.—A further Contribution to the Freshwater Plankton of the Scottish Lochs

Transactions of the Royal Society of Edinburgh ◽

10.1017/s0080456800035481 ◽

1906 ◽

Vol 41 (3) ◽

pp. 477-518 ◽

Cited By ~ 10

Author(s):

W. West ◽

G. S. West

Keyword(s):

Royal Society ◽

The West ◽

North West ◽

The North ◽

Freshwater Plankton ◽

Scottish Lochs

Our first investigation of Scottish plankton in 1901–2, although only tentative and somewhat meagre, was sufficient to show that, as regards the phytoplankton, the lochs of the west and north-west of Scotland were probably richer than any lakes previously examined. Owing to the extraordinary richness of the few collections then examined, it was considered eminently desirable that the investigation should be further extended. This we have been enabled to do by means of a third successive grant from the Royal Society, and the present paper is one of the results of a visit to the north-west of Scotland in July, August, and September, 1903.

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LXV. Astronomical observations made by order of the Royal Society, at Prince of Wales's Fort, on the north-west coast of Hudson's Bay. By William Wales and Joseph Dymond

Philosophical Transactions of the Royal Society of London ◽

10.1098/rstl.1769.0065 ◽

1769 ◽

Vol 59 ◽

pp. 467-488 ◽

Cited By ~ 7

Keyword(s):

West Coast ◽

Royal Society ◽

Astronomical Observations ◽

North West ◽

The North ◽

North Side

Mem. The thermometer marked A was hung within the southern, or lower observatory; in such a part as we judged would be least affected by the fire; close to, and with its ball exactly of the same height with, the quicksilver in the bason of the barometer: that marked B was hung without doors, on the north side of the observatory. The floor of the observatory might be above 50 feet above the level of the sea at low-water mark.

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XIII. Journal of a voyage, made by order of the Royal Society, to Churchill River, on the North-west Coast of Hudson's Bay; of thirteen months residence in that country; and of the voyage back to England; in the Years 1768 and 1769: By William Wales

Philosophical Transactions of the Royal Society of London ◽

10.1098/rstl.1770.0013 ◽

1771 ◽

Vol 60 ◽

pp. 100-136 ◽

Cited By ~ 5

Keyword(s):

West Coast ◽

Royal Society ◽

North West ◽

The North

It must be observed, that the Astronomical, and not the Nautical Day, is every where to be understood in the following Journal. ʘ May 29th. Having settled all my affairs in London; about 22 hours I set off for Greenwich, where I received my instructions from the Rev. Mr. Maskelyne, his Majesty's Royal Astronomer.

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

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100157838 ◽

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.

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