ACKNOWLEDGMENTS. 



The author would express his thanks to his friend Dr. 

 Peter Collier, Professor of Chemistry in the University 

 of Vermont, for a large shave of the calculations and re- 

 ductions required for the Tables pp. 150-6. 



Of the illustrations, fig's 3, 4, 5, 7, 47, 63, and 64, -were 

 drawn by Mr. Lockwood Sanford, the engraver. For oth- 

 ers, acknowledgments are due to the following authors, 

 from whose works they have been borrowed, viz. : 



ScHLEiDEN.— Fig's 10, 13, 17, 19, 30, 48, 49, and 50, 

 Physiologie der Pflanzen und Thiere. 



Sachs. — Fig's 56 and 65, Sitzungsberichte der Wiener 

 Akademie, XXXVII, 1859, and fig's 22, 38, 40, 41, 42, 

 43, 59, 66, 69, 70, and 71, MxperimentalrPhysiologie der 

 Pflanzen. 



PAYEisr. — Fig's 11, 12, and 23, Precis de Chimie Indus- 

 trielle. 



DucHAETEB. — Fig's 60 and 61, Elements de Botanique. 



KuHiT. — Fig's 18, 21a, 29, and 34, Ernahrung des 

 Jiindviehes. 



Haetig. — Fig's 20, 21b, 32, PJntwickelungsgescMchte 

 des Pflanzenheims. 



Ungee. — Fig. 26, Sitzungsberichte der Wiener Akade- 

 mie, XLIII, and fig. 55, Anat. u. Phys. der Pflanzen. 



ScHACHT. — Fig's 33, 37, 44, Anatomic der Gewcechse, 

 fig's 51, 53, 54, and' 62, Per Baum, and fig's 52, 57, and 

 58, Pie JSxirtoffel und ihre Kranlcheiten. 



Hekfeby. — Fig's 36 and 39, Jour. Boy. Ag. Soc. of 

 England, Vol. XIX, pp. 483 and 484. 

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