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ERRATA 



Page 288, line 14 from top, for M replenished," read " furnished." 

 Page 341, No. 14, for the locality " Fort Washington, Virginia," read "Fort 

 Washington, Maryland ;" — and the same in the description of Fig. 31, page 343- 

 Page 366, line 7 from bottom, for " nucleus," read §l nuclei." 

 Page 369, line 16 from bottom, before "errors" insert " from." 





