TntMs. -V. 5". Aj^. S.~\ 50 I>ac. li, 



tsrrv. Tlese irfer widely also in cbeoEUcal coo^posxtion : sonoe 

 jicicirxrr r — bSng a sohitioD of asphalt 



inccric:^ , irz^ae^ that a conadeia- 



bie qoanii^ cir : _ : ^^ ler. The a^fhalt in 



.- -- - -" — — ^^ "gnmjbeds" has 



M!stitntioQ have 



za whifdi the 



- - - 15 exca- 



rreica. 



VS"? 



Discuaaox. 



De: Bl X. iliirzy =- r':ijrei wriecis- aur zr2.iizdon. has been re- 

 cognized in ch.e rrprs of -lacs. ir. p^assnz tiiro::^ rh.e Coal-meas- 

 iHks ftcxa bekw uprsaids. 



De^ Xev^ekst r^£edth2£ dmereoces exisced, box the types were 

 lai^^ in^xkxiDed hw insea^ble cfaai^es^ Some Soas |xevail 

 tiirm%lMjartlie series: waile. on the other haiid, other types, sr.^.. the 



aodds^jpezr. 



D-tt-ier II. 1882. 



TfeePrcscT . - - S: 

 Frny-sii ne " ? 



feocn E . . _ - . _ __ : . . __ 



