ERR ATA. 



On page 1, 5th line, for "have" read "has." 



On page 8, 7th line from bottom, for "a part" read "parts." 



On page 10, for the amount of potash in No. 12 A, for "6.3368" read 

 0.3368." 



On page 48, 1st line, for "stopped" read "stoped." 



