8 ART. n. — K. oxo. 



B. Size of extranuptial nectaries. 



The following table shows the sizes of the fally developed 

 nectaries, in the plants which I studied. 



(Name of plant) (Longer diameter) (Shorter diameter) 



Polygonum sachalinense 3.0 mm. 2.0 mm. 



Polygonum cuspidatum 3.0 „ 2.0 ,, 



Prunus yedoensis 2.5 ,, 2.0 ,, 



Prunus Laurocerasus 2.3 „ 1.5 ,, 



Idesia joolycarpa 2.0 ,, 0.7 ,, 



Aleuriles cordata 1.5 ,, 1.0 ,, 



Viburnum opulus 1.5 „ 0.7 ,, 



Mallotus japonicus 1.5 ,, 1.0 „ 



Clerodendron trichotomum 0.75 ,, 0.75 „ 



Viburnum japonicum 0.7 ,, 0.5 ,, 



Ligusirum lucidum 0.7 ,, 0.45,, 



Syringa amurensis var. villosa 0.7 ,, 0.45,, 



Viburnum dilatatum 0.5 ,, 0.45,, 



Diospyros Lotus 0.5 „ 0.35,, 



Calliearpa japonica 0.4 ,, 0.4 ,, 



Diervilla grandiflora 0.3 ,, 0.2 ,, 



Paulownia tomentosa 0.3 „ 0.3 ,, 



Catalpa Kœmpferi 0.2 ,, 0.2 „ 



Tecoma grandiflora 0.2 „ 0.2 „ 



C. Structure of tlie secretory organ. 



We shall here describe the nectary in its parts, viz., 

 cuticle, secretory layer, subglandular layer, vascular system, and 



also the conspicuous cell contents, i. e. crystals and anthocyan. 

 a. Cuticle. 



In most cases the cuticle forms a simple coating to the 



