The trunks of these prehistoric trees are often of enormous size, especially the oaks.[146] One no fewer than 130 feet in length was unearthed in 1909. The wood, after its ages of immersion, has become black, hard, and heavy, like the Irish bog oak. Associated with such debris, the peat often furnishes remains of the dwellers in these archaic woodlands; whence we know that bears, wolves, wild boars, and gigantic wild bulls roamed their shades. In the skull of one of these last, now in the Sedgwick Geological Museum at Cambridge, is imbedded a flint axe-head. The arm of the primeval savage who wielded that weapon must have been strong beyond the arms of common men. [Footnote 146: The oaks are always found lying prostrate, but the fir stems are frequently still upright for several feet of their length.] [Illustration: _Burwell Church, West End._] The peat is cut with a spade of peculiar construction, being flat, and both longer and narrower than ordinary spades. It is shaped somewhat like a fire shovel with a flange on either side, the object being that each "turf" extracted should be of uniform size, like a brick. A thousand of these should go to the ton; but though uniform in size they are not of uniform weight, for the peat, as might be expected, is more dense at its lower levels than near the surface. There is a good market for this turf, which makes a hot and lasting fire with a minimum of smoke, and that pleasant smoke. It is mostly sent off by water to Cambridge, Ely, Wisbech, etc. This turf-cutting is not, of course, confined to Reach, but it has its greatest development here, and at the neighbouring village of Burwell, a mile or so to the eastward (to which, as we have seen, part of Reach belongs). Burwell is an important village of considerable extent, with a population of 2000, and a magnificent church, capable of seating them all. It is of the finest fifteenth century workmanship, with a few remains of Norman in the tower. The exterior is mostly flint; the interior, like that of so many churches in Cambridgeshire, is of "clunch," a hardened form of chalk, well adapted for building, and easily worked for carving. The beautiful sculptures of the Lady Chapel at Ely are of this material, drawn from the large quarries between Burwell and Reach. Clunch is found in many places throughout the county and has been worked (as existing remains show) ever since Roman days. Burwell Church is specially connected with the University of Cambridge, in whose gift is the preferment, burdened with the condition that on Mid-Lent Sunday a sermon shall be preached there by the Vice-Chancellor or his deputy. Till the nineteenth century this condition was no light one; for the roads were in such a state that half a dozen men on each side could hardly keep the preacher's carriage from overturning, and, whenever possible, the cortege took to the newly-ploughed fields in preference. The route was not round by Reach but direct from Swaffham Prior.