Vol . ir. 



I'liilos . Trans . 



II. XII . 



ri^.i. 



Fig. 2 



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D 



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Tig . 3 



rig.4- 



z 



rig . 6 





Fig . 7 



Wd ..•■•/ 



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Ccr c 



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Fig . 13 . 



Fig . 16 



W7. A 



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