670 NATURAL SCIENCE. X' 



the fallen material is just now thickly overgrown with coltsfoot and 

 other weeds. I hope, however, to be able to resume work soon, and 

 in the meantime I am engraving a map of the district, with a complete 

 set of sections, the chief implements, and the most noteworthy masses, 

 large and small, of conjoined examples. The full account, when pub- 

 lished, will throw light on numerous critical points of interest, which 

 will suggest themselves to readers, but which I have not adverted to 

 in this short note. 



WoRTHINGTON G. SmITH. 



