On the Fossil Floras of the Wyre Forest. 



317 



of a man. It is clear of course that the equation cannot be pressed too far ; 

 as to the value of the result found, we do not feel ourselves competent to 

 judge. The work may, however, be of interest as an example of the analysis 

 of somewhat complex experimental results by simple graphical methods. 



Table III. — Calculated Values of H by Equation (5) for the various Constant Eates of 

 Work, W, used in the Experiments, and the corresponding Observed Values of same. 



Mass. 



W = 



0. 



W = 



= 13. 



W = 



= 19. 



W = 



= 43. 



W - 



= 56. 



kgrm. 



Calc. H„. 



Obs. H. 



Calc. H. 



Obs. H. 



Calc. H. 



Obs. H. 



Calc. H. 



Obs. H. 



Calc. H. 



Obs. H. 







-138 





24 





99 





398 





562 





20 -0 



- 48 





45 





88 





259 





352 





43 7 



59 





120 





149 



177 



263 



279 



319 



346 



54 -6 



108 





161 



160 



186 



193 



284 



280 



338 



335 



55 -7 



113 





166 



169 



190 





287 



285 



340 





58 -8 



127 





178 



181 



201 





295 



298 



346 





60-5 



134 





184 





206 



212 



299 



317 



348 



347 



6L -9 



141 





190 



186 



212 



216 



303 



306 



352 



348 



66 -7 



162 





208 



209 



230 





315 



324 



362 



352 



80 -0 



222 





263 





281 





356 





397 





On the Fossil Floras of the Wyre Forest, with Special Reference to 

 the Geology of the Coalfield and its Relationships to the 

 Neighbouring Coal Measure Areas. 



By E. A. Newell Arber, M.A., Sc.D., F.G.S., F.L.S., Trinity College, Cambridge. 



(Communicated by Prof. T. McKenny Hughes, F.R.S. Received May 20, — 



Read June 5, 1913.) 



(Abstract.) 



In the absence of any detailed knowledge of the geology of the Wyre 

 Forest Coalfield, the area may be temporarily sub-divided into four regions. 

 Fossil floras are described from three of these : from the horizon of the Sweet 

 Coals in the Highleyarea in the north, from the unproductive beds of the Dowles 

 Valley in the centre, and from the horizon of the Sulphur Coals of the Southern 

 or Mamble area. On the evidence of the plants the Sweet Coal Series is 

 shown to belong to the Middle- Coal Measures, while the Sulphur Coal Series, 

 overlying the Sweet Coals unconformably, belongs to a higher horizon, the 

 Transition Coal Measures. The Dowles Valley unproductive measures 

 are shown to be Middle Coal Measures, which are there over 1000 feet in 



