♦ KNOWLEDGE ♦ 



ments and then tmployment m 

 tions have probably _, lined i 

 touch which weie quite unknot: 

 But even here the progress his 

 satisfy hi3 wints and the m it m 

 ^oing 1, numbei of modific iti ii 



panibt ii 

 nicety a 



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n 



RAMBLES WITH A HAMMER 



By W Jefome Harbison F G S 



HUNSTANTON \ND THE RED CHALK 



{nntniued fromji 221 ) 

 ? great geological attraction of Hunstanton is 

 bed of led rhu.ll which comes between the 



11.1 1 



It IS onlvfourft tluek 



spicnous Till e(louii 



which about G jicr . 



includin^ i 



J I 



use with a stiength sufficient to produce anj equality 

 in the tones The reason is very simple, but rather 

 curious. The E-xiensor communis Digiforum. muscle, 

 which moves the ring finger, is connected by lateral or 

 accessory tendons with the muscles of the neighbouring 

 digits, and when these are held down, the accessory 

 tendons prevent the free action of the muscular fibres of 

 the third finger, and hence the clumsy result. These 

 accessory tendons are sometimes found in both hands, 

 often only in one, which in this case is usually the right 

 hand. 



Occasionally, the extensor muscle of the ring finger 

 splits at the point of departure of the accessory 

 tendons, and when reunited leaves a button-hole ap- 

 pearance, and now and then these tendons are entirely 

 absent. The possibility of removing this restriction in 

 the use of the ring finger by dividing the accessory 

 tendons suggested itself many years ago, but it is only of 

 late years that the operation has become at all common. 

 Dp. Forbes, the Demonstrator of Anatomy at Jefferson 

 College, and Mr. Zeckwar, the Director of the Philadelphia 

 Musical Academy, have both been much interested in the 

 subject, and have done much to make the operation 



( f white chalk above, 

 r make s it very con- 

 iieioxido of iron, of 

 t I ushils are very 

 bnchiopod shells, 

 — which looks like 

 a tiny k d pencil — i \ i \ inn 



The so called fo sil j ii_, • — i branching body re- 

 semblin,, the finger cf a _,love — has been recently shown 

 by Dr Hmdt, net to be e rganic it all being probably the 

 filled up burrow of some mcicnt species of marme worm. 

 Above this red band we see in the cliff about 40 feet 

 of white chalk. As all the strata have a gentle dip to the 

 north-east, we can, l>y walking along the base of the 

 cliff, examine with convenience a considerable thickness 

 of the rocks. The chalk resting immediately on the 

 red bed is of a cream colour, and is full of the so- 

 called sponge branches ; above this is a grey stratum 

 containing manj' fragments of the shell Inoceramus ; all 

 higher is the ordinary white chalk. The red chalk can 

 be traced southwards to Snettisham, where it is exposed 

 in one of the great Carstone pits, but further south 

 all traces of it are lost. The keeper of the lighthouse 

 at Hunstanton spends his spare time in extracting the 

 fossils of the rock, and good specimens can usually be 

 obtained from him. 



In a northerly direction this red chalk can be traced 

 along the western foot of the Lincolnshire Wolds to 

 Speeton Cliff — six miles north of Flamborough Head — 



* The illustrations sho 

 right hand in its natural > 

 performed. 



■ respectively the muscular system of the 

 ondition and after the operation has been 



