Fin. 10. 



Esperiopfi.t chdUtiKjeri. A .Munuxonid S]>un;;e. < 'i'wo-thinls imtnrHl s>izi>.) 

 The figure oil tliu Icit sliows osciiliir, and tlmt on tlio riijht, |K>nil bUrfHCi-8 of 



till' upoULri! Iriillft.s. 



Til fact i>. 3X 



