Page 519, for first sentence of last paragraph read as follows: 



We have no exactly comparable chemical data for July, but analyses 



for August give percentages of saturation for Morris and Marseilles as follows: 



20.4 per cent, at Morris on the nth and 11 per cent, at Marseilles on the 12th; 



16.35 ?<?!■ cent, at Morris on the 22d and J.3d and 7.4 per cent, at Marseilles on 



the 24th and 25th. 

 Page 521, line 6 from bottom, and page 529, line Q, for chrysoleucas read cryso- 



leucas. 

 Page 525, line 22, and page 536, lines 21 and 24, for Ekmann read Ekmnn. 

 Page 532, line i. for Ancycliis read Ancyliis. 

 Page 551, line 7, for 00 read 512. 

 Page 615, second line above foot-note, for 106 read 94. 

 Page 616, line i, for the second Biindeln read Bilndel; line 2, for Biindclu read 



Bi'indcls ; line 3, for ausscni read ausscren; line 6, for cweicrlic read czvcicrlci. 

 Page 629, line 12, for kciii read keiiicn. 

 Page 634, line 9, for iinteriiommcn read uutcruommcncu ; and in line 14 from 



bottom, after 525 insert 13 iig. 

 Plate III, Fig. i, after the word mixed in legend insert consocies of the. 

 Plate IX, Fig. 2. dele the legend and read instead : Root-system of Tcphrosia 



virginiana, exposed by blowing of the sand. 

 Plate X, Fig. 2, dele the legend and read instead : A blowout almost stabilized 



by bunch-grasses, especially Leptoloma cognatum. 

 Plate XXXIX, for Calamogrostis read Calamagrostis. 

 Plate LIV, exchange places of cuts, but not the legends. 

 Plate LXXXV, for 7 read /c. 





