Page 463, line 4, for to read in; line 5, for peculiar in read peculiar to. 



Page 484, in table, transpose Vegetation- poor and Vegetation-rich. 



Page 501, line I, for show read shown. 



Page 505, last line of table, column 4, for .4 read 4. 



Page 510, line 9, add, a«rf f 7 ^//^ (.'oj). 



Page 546, line 15 from bottom, after is read in the main. 



Page 549, line 1 below heading, page 551, line 1, and page 556, line 3, for Cgjb 

 read {'97a). 



Page 556, line 7, before 'oj read '01 and. 



Page 560, table, second column, line 4 from bottom, for ('00b) read {'00),; line 6 

 from bottom, for Jung read Yung; line 16 from bottom, for ('95) read ('93); line 17 

 from bottom, for ('gg) read ('00); line 19 from bottom, for {'gj) read Cg6). 



Page 984, at head of second column, for i8g? read i8g8 ; under remarks, line 4, 

 for above read along. 



Pages 597 and 598, below table, read *Bottom visible. 



Page 598, eighth column, line 7 from bottom, foro./<5 read 0.28. 



Pages 599-603, 606-610, 612, and 613, below table, read *Plankton not collected on 

 same date as sample for wateranalysis. 



Pages 599-613, columns 2-4, meaning of symbols, abbreviations, etc., as follows : 

 + = rising river level. v. d. = very decided. 



— = falling river level. v. m. = very much. 



± = stationary river level. Decimal in color column = volume 



c. = considerable. of standard ammonium chloride 



d. = distinct ; decided. solution required to develop the 

 f. = filtered. same tint when diluted to fifty cu- 

 1. = little. bic centimeters with ammonia- 



m. = much. free water and treated with the 



n. f. = not filtered. usual amount of nessler reagent 



s. = slight. 



