458 



THE GEOLOGIST. 



spot, and found our anticipations more than realized ; for it turned out to 

 be the tusk of a "great Mammoth," such as is very rarely found in this 

 country. 



The specimen is in a fine state of preservation, and measures 2 feet in 

 circumference, and 9 feet in length. It lay at the bottom of a very old 

 drift-gravel, and on the true bed of the Xeuper marl, at a depth of 

 11 feet from the surface. 



It is very interesting to find Mammoth bones on the virgin-surface of an 

 old formation, as it establishes to my mind, beyond a doubt, the existence 

 of the Mammoth before the " drift." 



Some have doubted whether the Mammoth really was an inhabitant of 

 this country ; but this has been long set at rest ; and here is undoubted 

 evidence of the fact of its local existence. The specimen is very little 

 water-worn. 



I do not know that any further remarks are necessary. The specimen 

 in the course of this day will be lodged in the Leicester museum. 



I am, dear Sir, yours very truly, 



Feancis Deake, F.G-.S. 



30, Market St., Leicester, 27 th Oct., 1863. 



Geological Section Making. 



Sie, — Perhaps you may think it worth while to mention in your journal 

 a very simple contrivance which I devised for the purpose of laying down 

 the contour of a piece of ground, of which I desired to make a geological 

 section. From its extreme simplicity, combined with very tolerable effi- 

 ciency, I think it would often be found useful where mathematical exact- 

 ness is not required. 



A B is a square piece of board, 

 — accuracy of form is immaterial. 

 It may be of any size, say six inches 

 square. E is a piece of lead, bent 

 so as to embrace the lower edge, 

 and capable of being made to slide 

 tightly along it. D is an awl pass- 

 ing loosely through a hole at C. 

 P P are two common pins, stuck 

 into the upper edge of the board. 



To adjust this instrument, it is only 

 necessary to slide the weight along 

 the edge of the board, until the heads 

 of the two pins rest in a horizontal 

 line, when it is suspended by the handle D. This may be done either by 

 fixing a mark at the level of the eye, and looking at it from a little dis- 

 tance along the line P P, taking care that the feet are on the same level 

 as when fixing the mark, which may be ensured by standing on the shore 

 of a pond or the sea; or else the adjustment may be effected by sliding 

 the weight until the same point of a distant object is seen along the line 

 P P, when the two pins are interchanged by bringing first one and then 

 the other next the eye. 



The proper position of the weight having been determined, the instru- 

 ment is ready for use. 



Suppose the contour of a hill desired. Take your stand at the lowest 

 point at which the section is required to commence ; hold one of the pin- 



