ADDENDA AND COERIGBNDA. 



Page 1, line ifoi- " grow-" read "growth-"- 



„ 63, line 14 /or " developement " read " development." 



„ 120, Fig. 23 is copied from Pfeffer's paper in Abhandl. k. Sachs 

 Gcs. Band xx. 1893. 



„ 121, line 8 /or " silk-paper " read " tissue-paper ". 



,, 138, 141, Figs. 25 and 26 are from the Catalogxie of the Cam- 

 bridge Scientific Instrument Company. 



