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DENDROCOMETES (so named by F. Stein)

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Originally appearing in Volume V08, Page 20 of the 1911 Encyclopedia Britannica.
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DENDROCOMETES (so named by F. See also:Stein)  , a genus of suctorian See also:Infusoria, characterized by the repeatedly branched attached See also:body; each of the lobes of the body gives off a few retractile tentacles . It is parasitic on the gills of the so-called See also:freshwater See also:shrimp Gammarus pulex . For its conjugation see See also:Sydney H . Hickson, in Quarterly Journ. of Mlzcrosc . See also:Science, vol xlv . (1902), p . 325 . DENE-HOLES, the name given to certain caves or excavations in See also:England, which have been popularly supposed to be due to the Danes or some other of the See also:early See also:northern invaders of the See also:country . The See also:common spelling " Dane hole " is adduced as See also:evidence of this, and individual names, such as See also:Vortigern's Caves at See also:Margate, and Canute's See also:Gold Mine near See also:Bexley, naturally follow the same theory . The word, however, is probably derived from the Anglo-Saxon den, a hole or valley . There are many underground excavations in the See also:south of the country, also found to some extent in the midlands and the See also:north, but true dene-holes are found chiefly in those parts of See also:Kent and See also:Essex along the See also:lower See also:banks of the See also:Thames . With one exception there are no recorded specimens farther See also:east than those of the Grays Thurrock See also:district, situated in Hangman's See also:Wood, on the north, and one near See also:Rochester on the south See also:side of the See also:river .

The See also:

general outline of the formation of these caves is invariably the same . The entrance is a See also:vertical See also:shaft some 3 ft. in See also:diameter falling, on an See also:average, to a See also:depth of 6o ft . The depth is regulated, obviously, by the depth of the See also:chalk from the See also:surface, but, although chalk could have been obtained See also:close at See also:hand within a few feet, or even inches, from the surface, a depth of from 45 to 8o ft., or more, is a characteristic feature . It is believed that dene-holes were also excavated in See also:sand, but as these would be of a perishable nature there are no available data of any value . The shaft, when the chalk is reached, widens out into a domed chamber with a roof of chalk some 3 ft. thick . The walls frequently See also:contract somewhat as they near the See also:floor . As a See also:rule there is only one chamber, from 16 to 18 ft. in height, beneath each shaft . From this excessive height it has been inferred that the caves were not primarily intended for habitations or even hiding-places . In some cases the chamber is extended, the roof being supported by pillars of chalk See also:left See also:standing . A rare specimen of a twin-chamber was discovered at See also:Gravesend . In this See also:case the one entrance served for both caves, although a See also:separate See also:aperture connected them on the floor level . Where galleries are found connecting the See also:chambers, forming a bewildering See also:labyrinth, a careful See also:scrutiny of the walls usually reveals evidence that they are the See also:work of a See also:people of a much later See also:period than that of the chambers, or, as they become in these cases, the halls of the galleries .

Isolated specimens have been discovered in various parts of Kent and Essex, but the most important See also:

groups have been found at Grays Thurrock, in the districts of See also:Woolwich, See also:Abbey Wood and Bexley, and at Gravesend . Those at Bexley and Grays Thurrock are the most valuable still existing . It is generally found that the See also:tool work on the roof or See also:ceiling is rougher than that on the walls, where an upright position could be maintained . Casts taken of some of the pick-holes near the roof show that, in all See also:probability, they were made by See also:bone or See also:horn picks . And numerous bone picks have been discovered in Essex and Kent . These pick-holes are amongst the most valuable data for the study of dene-holes, and have assisted in fixing the date of their formation to pre-See also:Roman times . Very few See also:relics of antiquarian value have been discovered in any of the known dene-holes which have assisted in fixing the date or determining the uses of these prehistoric excavations . See also:Pliny mentions pits sunk to a depth of a See also:hundred feet, " where they branched out like the See also:veins of mines." This has been used in support of the theory that dene-holes were See also:wells sunk for the extraction of chalk; but no known dene-hole branches out in this way . Chretien de See also:Troyes has a passage on underground caves in See also:Britain which may have reference to dene-holes, and tradition of the 14th See also:century treated the dene-holes of Grays as the fabled gold mines of Cunobeline (or Cymbeline) of the 1st century . Vortigern's Caves at Margate are possibly dene-holes which have been adapted by later peoples to other purposes; and excellent examples of various pick-holes may be seen on different parts of the walls . See also:Local tradition in some cases traces the use of these caves to the smugglers, and, when it is remembered that illicit See also:traffic was common not only on the See also:coast but in the Thames as far up the river as See also:Barking See also:Creek, the theory is at least tenable that these ready-made hiding-places, difficult of approach and dangerous to descend, were so utilized- There are three purposes for which dene-holes may have been originally excavated: (a) as hiding-places or dwellings, (b) draw-wells for the extraction of chalk for agricultural uses, and (c) See also:store-houses for See also:grain . For several reasons it is unlikely that they were used as habitations, although they may have been used occasion-ally as hiding-places .

Other evidence has shown that it is equally improbable that they were used for the extraction of chalk . The See also:

chief reasons against this theory are that chalk could have been obtained outcropping close by, and that every trace of loose chalk has been removed from the vicinity of the holes, while known examples of chalk draw-wells do not descend to so See also:great a depth . The See also:discovery of a shallow dene-hole, about 14 ft. below the surface, at See also:Stone negatives this theory still further . The last of the three possible uses for which these prehistoric excavations were designed is usually accepted as the most probable . Silos, or underground storehouses, are well known in the south of See also:Europe and See also:Morocco . It is supposed that the grain was stored in the See also:ear and carefully protected from See also:damp by See also:straw . A curious smoothness of the roof of one of the chambers of the Gravesend twin-chamber dene-hole has been put forward as additional evidence in support of this theory . One other theory has been advanced, viz. that the excavations were made in See also:order to get flints for implements, but this is quite impossible, as a careful examination of a few examples will show . Further reference may be made to Essex Dene-holes by T.V . See also:Holmes and W . See also:Cole; fo The Archaeological See also:Journal (1882); the Transactions of the Essex See also:Field See also:Club; Archaeologia Cantiana . &c.; Deneholes by F .

W . Reader, in Old Essex, ed . A . C . Kelway (1908) . (A . J .

End of Article: DENDROCOMETES (so named by F. Stein)
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