50 SUPPLEMENT TO BOTANICAL REPORT — 1 878. 



Between the above five types of floras various intermediate 

 varieties are met with. The flora of alluvial loam and warp is of a 

 mixed character, correspondingwith the compositechemical nature 

 of the soil and the various nature of the rocks from which it was 

 derived. The flora of the boulder clay in places approaches a 

 calcareous type owing to the large number of limestone boulders 

 and debris which it contains. 



In tracing out instances bearing upon the problems of plant 

 distribution, the members of the Yorkshire Naturalists' Union 

 may find a wide and promising field for investigation, and though 

 the scientific value of the work of each individual worker among 

 us may be small taken by itself, yet pieced together by a skilful 

 hand the results may possibly in time combine to form a substantial 

 addition to the sum of human knowledge respecting the history 

 of our earth and its vegetation. 



-o*«»<- 



CORRECTION. 



Since page 37 was printed off, Mr. William West has pointed 

 out that Gymiioinitriuin concinnatutn was there erroneously inserted 

 in the list of Hepaticee, the error having arisen through a 

 misunderstanding arising in the course of correspondence. — Ed. 



- ^ «o»^- 



Trans. Y.N.U., 1878. Series E 



