-13- 



the nucleus 59, Cf. also liCulti-Buclear 



Cells and Nuclear Division. 

 Nutrj.tive Epidermis 215, 

 Nutritive Hairs 215,, 

 Nutritive Parenciiyma 215ff , 

 Nutritive Tissue in Galls 214ff» 

 Nymphaea 149., 

 Ochroma 95ff, 

 Octomeria 59 « 

 Oedema 77, 



Oedogonium 9, 13, 31, 126, 

 Olea 97, 117, 186 « 

 Oil in Erineum hairs 107, 



Oogonia, Vegetative development in Vaucheria 28, 

 Opening Mechanisms in Galls 213,« 

 Opuntia 56, 



Orchids, Pormation of netted cells after injury 60, 90, 

 Orchis 35, 



Orificial Wall of the Sac Galls 194. 

 Osmatic Pressure 112ff., Influence on tissue formation 



241, 

 Ostrya 97, 151. 

 Overgrowth 151. 

 Ovula, Hypoplasia 48, 

 Oxalis 132, 243, 



Oxydases, Formation in variegated leaves after injury, 

 After infection by parasites, etc. 33ff., In- 

 ''' flue nee on the chlorophyll 33ff, 

 Oxygen, Influence on the spore formation of the an- 

 aerobic bacteria 238, 

 Oxytrichides 26 « 

 Padina 67, 88, 

 Pale-green Varieties (Chrysanthemum, ets.), Hypoplasia 



19ff, 

 Panax 82, 



Pandanus 34, 75, 82, 



Papilionaceae, Scanty tylose formation 96., 

 Parenchyma, Formation characteristic of all galls 205, 

 Parinariura 196ff,, 

 Passiflora 95ff, 



Pathological, Explanation of the term 1, 

 Paul own ia 97 » 



"Pediaspis Aceris, Fig. 115, 

 Pelargoniiim 74, 

 Pelvetia 16. 

 Pemphigus 192ff, P. Marsupialis, Fig. 92, bursarius, 



Fig. 95, 

 Penium 9, 

 Peperomia 154, 

 Periderm 16, . 

 Peridermiiim 177, 183, 

 Peridineae, Hypoplasia 28, 

 Perilla 58, 97, 

 Pestaloaaia 184, 

 Petunia 36 « 

 Peasiza 115, 

 Phaeophyceae, Regeneration of the bark tissue 15, 



Galls of, Cf. Algae. 

 Phalaris 33. 

 Pharbitis 97. 



Phaseolus 61, 78, 85, 135. 

 Phelloderm, Hypertrophy of the 73, 



