V. 



Figure 11, 

 ^(p. 47) 



Figure IE. 

 (p. 51) 



Figure 13, 

 (p. 65) 



Figure 14. 

 (p, 70) 



Figure 15 » 

 (. 71). 



Figure 16. 



fp. is). 



Figure 17, 

 (p. 75) 



Figure 18. 

 (p. 80) . 



Figure 19, 

 (p. 80) 



Figure to, 

 (p. 84) . 



Figure 21, 

 (p. 65) 



Caraaiaine prat ens is . Cross-sections of 

 leaves, a; terrestial form; b, aquatic 

 form* (After Schenck) • 



BanunculuB fluitans . Cross-sect iSns through 

 the leaf- tip; a, of the aquatic form, 

 (magnif, 90); b, of the terrestrial 



. fmagnij. 60) ♦ (After Schenck) . 



Lumilaria., . Irregular thickening of the walls 

 in the root-hairs. At the left . Bphaeto- 

 crystalloia thickenings. At the r igh;t? ■ 

 conical and bear.i-like forms, (After lan>- 

 mermayr) . 



Spirogyra . Diagrams of multicellulair cells. 

 Below, a cell containing 8 nuclei, but 

 with incomplete formation of cross walls, 

 (After V, Wisselingji) . 



Bacterium iPasteurianum , Development; trans- 

 formation of short clubs to long threads 

 when grown on double-beer agar 40.5 de- 

 grees C, a, chain of 8 short clubs after 

 6| and after SO hours (a' a" a"'); h, 

 chain of 6 short clubs after 5 and 9 hours 

 (b» and b") ; c and d, after 10 and after 

 SI hours respectively, (After Hansen, from 

 Lafar "Techn, luykologie") . 



Solanum tuberosTtm. Hypertrophied guard cells. 

 ' (After Stapf). 



Prunus spinosa . Some cells from a lenticel 

 excrescence, (After Devaux) . 



Ribes aureum. Gutting. 'She upper part 

 shows strong outgrov/ths and broad rifts 

 in the batk, (Original) 



Bib os aureum . Oross-seotion thBuugh part 

 of greatly hypertrophied bark. Above, 

 cork, (K) , below, bark cells grown out 

 into long pouches (H) ; the immature 

 periderm elements have also been enlarged 

 greatly by stretching. (Original) . 



Cassia tomentos a. Gross-sections through 

 part of a leaf. The cells of the upper- 

 most mesophyll layer have swollen up to 

 an ''intumescence" and have split the 

 epidermis, (After Sorauer) . 



Ficus elastioa . Intumescence of the leaf. 

 %.e cells of the uppermost layer of 

 mesophyll have elongated and pressed the 

 epidermal cells together* Only the up- 

 per half of the leaf is drawn. (Original) 



