278 



TIIK AMERICAX XATURALIST [Vol. XLI 



indiciitioiis of tlic coiitiiioiital orio-in of a o-ivon formation. Applying 

 the results of his studies to specilic portions of the geologieal column, 

 the author concludes that certain important formations, heretofore gen- 

 erally referred to a marine origin, are most probabh' continental 

 depasits. 



Professor Barrell's j)a])er is an important contrihution to a series 

 of studies which urr rcsultiiiii- in a vcrv nianif<-st niovcniciit away 



' 1). \V. J. 



Observations in South Africa. — Professor W. .M. Davi-, |)rcscnts^ 

 l)is visit to the Colonies of South Africa in ihc snniincr of MlOo. 



Hric.l. and th.- pn.l'.l.'nis lo l,c r.l.idnvd l.ricflv .lalcd. The next 

 tucntx paov. arcrnainlv c.mrvnM.l uith a .tndv..f ihc (ape Colonv 

 ran-.- .•nnH<lrivd uith ^pr.ial n-ard „. ,|,nr n'MMuLlance to the 



of its origin, the evidence being weighed with a desire to discriminate 



leveling without baselevcling as the other. ( )thcr problems of interest, 

 MK-h a- the ori-in of l\u- ziu"-/.-!- -or-v l.rlnu the \-i< toria falls of the 



I). W. J. 



Geology of the Big Horn Mountains.- The results of five seasons' 

 field work in the Pig Horn Mountains of Wyoming and Montana 



17, i.i>. :!77-4.W, lOOG. 

 nil Taper No. 51, 1906, 12<S pp. 



