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 with its characteristic fishes, the strata consisting of sandstones, flagstones with thin impure limestones. The rocks of Dunnet Head, which are provisionally classed with the upper Old Red Sandstone, are composed of red and yellow sandstones, marls and mudstones. Hitherto no fossils have been obtained from these beds save some obscure plant-like markings, but they are evidently a continuation southwards of the sandstones of Hoy, which there rest unconformably on the flagstone series of Orkney. This patch of Upper Old Red strata is faulted against the Caithness flagstones to the south. For many years the flagstones have been extensively quarried for pavement purposes, as for instance near Thurso, at Castletown and Achanarras. Two instances of volcanic necks occur in Caithness, one piercing the red sandstones at the Ness of Duncansbay and the other the sandstones of Dunnet Head north of Brough. They point to volcanic activity subsequent to the deposition of the John o’ Groats beds and of the Dunnet sandstones. The materials filling these vents consist of agglomerate charged with blocks of diabase, sandstone, flagstone and limestone.

An interesting feature connected with the geology of Caithness is the deposit of shelly boulder clay which is distributed over the low ground, being deepest in the valleys and in the cliffs surrounding the bays on the east coast. Apart from the shell fragments, many of which are striated, the deposit contains blocks foreign to the county, as for instance chalk and chalk-flints, fragments of Jurassic rocks with fossils and pieces of jet. The transport of local boulders shows that the ice must have moved from the south-east towards the north-west, which coincides with the direction indicated by the striae. The Jurassic blocks may have been derived from the strip of rocks of that age on the east coast of Sutherland. The shell fragments, many of which are striated, include arctic, boreal and southern forms, only a small number being characteristic of the littoral zone.

Climate and Agriculture.—The climate is variable, and though the winter storms fall with great severity on the coast, yet owing to proximity to a vast expanse of sea the cold is not intense and snow seldom lies many days continuously. In winter and spring the northern shore is subject to frequent and disastrous gales from the N. and N.W. Only about two-fifths of the arable land is good. In spite of this and the cold, wet and windy climate, progressive landlords and tenants keep a considerable part of the acreage of large farms successfully tilled. In 1824 James Traill of Ratter, near Dunnet, recognizing that it was impossible to expect tenants to reclaim and improve the land on a system of short leases, advocated large holdings on long terms, so that farmers might enjoy a substantial return on their capital and labour. Thanks to this policy and the farmers’ skill and enterprise, the county has acquired a remarkable reputation for its produce; notably oats and barley, turnips, potatoes and beans. Sheep—chiefly Leicester and Cheviots—of which the wool is in especial request in consequence of its fine quality, cattle, horses and pigs are raised for southern markets.

Other Industries.—The great source of profit to the inhabitants is to be found in the fisheries of cod, ling, lobster and herring. The last is the most important, beginning about the end of July and lasting for six weeks, the centre of operations being at Wick. Besides those more immediately engaged in manning the boats, the fisheries give employment to a large number of coopers, curers, packers and helpers. The salmon fisheries on the coast and at the mouths of rivers are let at high prices. The Thurso is one of the best salmon streams in the north. The flagstone quarries, mostly situated in the Thurso, Olrig and Halkirk districts, are another important source of revenue. Of manufactures there is little beyond tweeds, ropes, agricultural implements and whisky, and the principal imports consist of coal, wood, manure, flour and lime.

The only railway in the county is the Highland railway, which, from a point some four miles to the south-west of Aultnabreac station, crosses the shire in a rough semicircle, via Halkirk, to Wick, with a branch from Georgemas Junction to Thurso. There is also, however, frequent communication by steamer between Wick and Thurso and the Orkneys and Shetlands, Aberdeen, Leith and other ports. The deficiency of railway accommodation is partly made good by coach services between different places.

Population and Government.—The population of Caithness in 1891 was 33,177, and in 1901, 33,870, of whom twenty-four persons spoke Gaelic only, and 2876 Gaelic and English. The chief towns are Wick (pop. in 1901, 7911) and Thurso (3723). The county returns one member to parliament. Wick is the only royal burgh and one of the northern group of parliamentary burghs which includes Cromarty, Dingwall, Dornoch, Kirkwall and Tain. Caithness unites with Orkney and Shetland to form a sheriffdom, and there is a resident sheriff-substitute at Wick, who sits also at Thurso and Lybster. The county is under school-board jurisdiction, and there are academies at Wick and Thurso. The county council subsidizes elementary schools and cookery classes and provides apparatus for technical classes.

History.—The early history of Caithness may, to some extent, be traced in the character of its remains and its local nomenclature. Picts’ houses, still fairly numerous, Norwegian names and Danish mounds attest that these peoples displaced each other in turn, and the number and strength of the fortified keeps show that its annals include the usual feuds, assaults and reprisals. Circles of standing stones, as at Stemster Loch and Bower, and the ruins of Roman Catholic chapels and places of pilgrimage in almost every district, illustrate the changes which have come over its ecclesiastical condition. The most important remains are those of Bucholie Castle, Girnigo Castle, and the tower of Keiss; and, on the S.E. coast, the castles of Clyth, Swiney, Forse, Laveron, Knockinnon, Berriedale, Achastle and Dunbeath, the last of which is romantically situated on a detached stack of sandstone rock. About six miles from Thurso stand the ruins of Braal Castle, the residence of the ancient bishops of Caithness. On the coast of the Pentland Firth, 1 miles west of Dunscansbay Head, is the site of John o’ Groat’s house.

CAIUS or, pope from 283 to 296, was the son of Gaius, or of Concordius, a relative of the emperor Diocletian, and became pope on the 17th of December 283. His tomb, with the original epitaph, was discovered in the cemetery of Calixtus and in it the ring with which he used to seal his letters (see Arringhi, Roma subterr., l. iv. c. xlviii. p. 426). He died in 296.

CAIUS [Anglice, etc.], JOHN (1510–1573), English physician, and second founder of the present Gonville and Caius College, Cambridge, was born at Norwich on the 6th of October 1510. He was admitted a student at what was then Gonville Hall, Cambridge, where he seems to have mainly studied divinity. After graduating in 1533, he visited Italy, where he studied under the celebrated Montanus and Vesalius at Padua; and in 1541 he took his degree in physic at Padua. In 1543 he visited several parts of Italy, Germany and France; and returned to England. He was a physician in London in 1547, and was admitted fellow of the College of Physicians, of which he was for many years president. In 1557, being then physician to Queen Mary, he enlarged the foundation of his old college, changed the name from “Gonville Hall” to “Gonville and Caius College,” and endowed it with several considerable estates, adding an entire new court at the expense of £1834. Of this college he accepted the mastership (24th of January 1558/9) on the death of Dr Bacon, and held it till about a month before his death. He was physician to Edward VI., Queen Mary and Queen Elizabeth. He returned to Cambridge from London for a few days in June 1573, about a month before his death, and resigned the mastership to Dr Legge, a tutor at Jesus College. He died at his London House, in St Bartholomew’s, on the 29th