Ill 



PLATE XLII. Datura Stramonium. 1, Flowering shoot 

 ( x 1) ; 2, Ripe capsule, opened ( x 2) ; 3, Ripe seed ( x 25) ; 

 4, Longitudinal section of the seed ( x 182) ; 5, Epidermal, cells 

 ( x 540) ; 6, One of the above separated by maceration ( x 402) ; 

 7, Transverse section of ripe seed ( x 42) ; 8, Germinating seed 

 ( x 18) ; 9, Somewhat older plant with cotyledons ( x 9) ; 

 10, Same plant further advanced ( x 18). 



332. A series of botanical wall diagrams, in sheet; 

 size, 33 in. by 27 in. Explanatory text in German. 

 Designed by Drs. A. Tschirch and B. Frank. (An 

 incomplete set.) 



Published by Paul Parey, Berlin. 1890. 



333. Diagrams (8) illustrating Prof. Archer's first 

 steps to economic botany. Prepared for the Science 

 and Art Department. 1854. 



Published by Lovell Reeve. 



334. Diagrammatic model, devised by Dr. F. Noll, 

 for illustrating the growth in thickness of the stems of 

 Dicotyledons. 



E. 27. 1887. Published by N. G. Ehvert, Marburg. 



There are two bands, one representing cortex, the other wood 

 and pith. Over their line of junction is placeda strip marked in 

 cells to represent the cambium. A cord acting round a roller works- 

 the apparatus, and as the cambium deposits woody tissue on one 

 side of it, and so is forced outwards, it also deposits cortical tissue 

 on its outer surface, so that both wood and cortex increase in 

 thickness pari passu. 



335. A series of diagrams exhibiting in a graphic 

 manner the absolute and relative quantities of the main 

 constituents of food in fifty samples of wheat, barley, 

 and oats, grown under various conditions. A specimen 

 of the grain analysed is attached to each diagram. Pre- 

 pared by Professor Tanner for the Science and Art 

 Department. 



1878. Published by Chapman and Hall. 



336. Elevations and plan of the laboratory for bo- 

 tanical research, presented to the Royal Gardens, Kew r 

 by T. J. Phillips Jodrell, Esq. 



Lent by Her Majesty's Office of Works. 1876. 



