CORRECTIONS AND ADDITIONS. 



Page 9, line 27 from the top, after adopted, insert : — The recent important in- 

 vestigations of M. Fremy lead to the conclusion, that cellulose 

 exists in several isomeric conditions, which differ inaterially in 

 their chemical properties ; thus, he has noticed four different 

 kinds of cellulose, which he has termed respectively, cellulose, 

 para-cellulose, vasculose, and fibrose. The first exists, according 

 to him, in the cell-walls of the albumen of certain seeds, in those 

 of cotton, and in liber-cells ; the second in the pith and medullary 

 rays ; the third in the vessels generally ; and the fourth in the 

 ordinary wood-cells. The first is soluble in cuprate of ammonia ; 

 but the other kinds are insoluble. 



Page 20, line 26 from the bottom, qfter O^, refer to page 744 for more recent 

 investigations upon Chlorophyll. 



Page 21, line 6 from the top, after plants, omit except the Fungi. 



Page 22, line 22 from the top, offer Carex arenaria, omit the next sentence, 

 and insert instead, also by C'lrrey and Tulasne in certain Fungi, 

 and by Schenck in Ornithogalum nutans and 0. lanceolatum. 



Page 26, line 4 from the top, /or oxalate read carbonate. 



Page 31, lines from the top, /or Fig. 56 read Fig. 57; also, same page, /or Figs. 

 56 and 57 read Figs. r>7 and 56. 



Page 37, line 21 from the bottom, after Fig. 75, insert: — M. Fremy has recently 

 made some experiments upon the latex, and he states, that he has 

 found in certain plants, a kind of latex as albuminous as the serum 

 of the blood or the albumen of the egg, and to which he has given 

 the name of albuminous latex. Should his experiments be con- 

 firmed, they will have a most important bearing on vegetable phy- 

 siology, as they will prove that the latex, contrary to what has 

 been generally believed, is a truly organizing liquid resembling in 

 composition the organs in process of formation. 



Page 38, line 10 from the top, after spiral, insert and the other vessels. (See 

 also page 728 for a further notice of Trecul's observations.) 



Page 49, Fig. 116, put b over the two right hand figures. 



Page 57, line 9 from the top,/or p. 7 read p. 17. 



Page 163, line I at the top, after some kinds of Senna erase (Cassia obovata) ; 

 and in description of Fig. 313, a, for leaflet of Cassia obovata read 

 leaflet of a species of Cassia. 



Page 248, line 5 from the bottom, erase and Tulip (^Fig. 510). 



Page 249, in description of Fig. 510, for innate, read introrse. 



Page 255, line 7 from the top,/or Fig. 520, read Fig. 530. 



Page 266, line 6 from the top,/or that volume, read this volume. 



Page 316, Fig. 684 is inverted. 



Page 333,/or Fig. 719, put Fig. 720. 



Page 333,/or Fig. 720, put Fig. 719. 



