Page 354, 3d line from end of (6) insert after “solution” “acidified with acetic and;” same line, transfer “r” from “ther,” to “pecipitate.”

Page 357, 6th line from end of (4) insert after “difference” “and the phosphoric acid estimated as in 380, deducted therefrom.”

Page 367, 4th line, add after “taken,” “The phosphoric acid may be determined as described in 372, or following paragraphs.”

Page 410, line 21, dele “dilute” and insert “one per cent nitric.”

Page 410, line 25, after “capsule” insert “adding water once or twice.”

Page 449, 4th line read “hydrobromic” for “hydrochloric.”

Page 457, reference “30” read “Band 38” instead of “Band 37.”

Page 468, 8th line, dele “or gypsum” and read “200” instead of “50.”

Page 471, last line, read “not” for “very.”

Page 472, 4th line, insert “un” before “successful.”