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



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



Page 501, line I. iox show read shown. 



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



Page 510, line 9, add, and Volk ('oj). 



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



Page 549, line i below heading, page 551, line i, and page 556, line 3, for {'gyb 

 read {'gya). 



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



Page 560, table, second column, line 4 from bottom, for i^oob) read i^oo),; line 6 

 from bottom, for /itttg read Yting; line 16 from bottom, for ('95) read i'gj) ; line 17 

 from bottom, for (99) read ('00); line 19 from bottom, for {'gj) read {'g6). 



Page 584, at head of second column, iov iSgy read /Sg8 ; 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, iox 0.16 read 0.28. 



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

 same date as sample for water analysis. 



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. 



zb = 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. 



