105 



PLATE L. Transverse section of a reduced vascular bundle 

 from the stem of Elodea canadensis, Rich, and Michx. 



PLATES LI.-LIII. Anatomy of the wood of Pinus silvestris, L. 



PLATE LIV. Transverse section through the central cylinder 

 of the root of Asparagus officinalis, L. 



PLATE LV. Transverse section through the central cylinder 

 of the root of Musa sapientum, L, 



PLATE LVI. Transverse section through the central cylinder 

 of the root of Vicia Faba, L., at the commencement of the forma- 

 tion of the secondary wood. 



PLATE LVII. A similar section made after the formation of 

 secondary wood has made some progress. 



PLATE LVIII. Development of the periderm in young shoots 

 of Sorbus Aucuparia, L. 



PLATE LIX. Development of the ring of bark in year-old 

 twigs of Vitis vinifera, L. 



PLATE LX. Development of the bark scales in young stems 

 of Quercus sessiliflora, Sm. 



PLATES LXL, LXII Development of lenticels on twigs of 

 Syringa vulgaris, L. 



PLATES LXIJL-LXV. Development of Sphceroplea annulina, 

 Ag., var. crassisepta, Heinr. 



PLATES LXVI, LXVII. Development of the embryo of Alisma 

 Plantago, L. 



PLATES LXVIII.-LXXIII. Structure and development of the 

 Lichens : Dictyonema sericeum, Mont., Ephebe pubescens (L.), 

 Lichina pygmcea, Ag., Gollema pulposum (Bernh.), Gyalecta 

 cupularis (Ehrh.) ; Physcia parietina (L.), Cora pavonia, Fr. 



PLATES LXXIV.-LXXYI. Structure of the wood of Quercus 

 sessiliflora, Sm. 



PLATE LXXVII. Apical growth and branching of Delesseria 

 alata (Huds.). 



PLATE LXXVIII. Cell-division in the young starninal hairs of 

 Tradescantia virginica, L. 



PLATE LXXIX. Secondary growth in thickness of the stem 

 of Dracaena Draco, L. 



PLATE LXXX. Concentric vascular bundle from the zone of 

 secondary growth in the stem of Draccena Draco, L. 



PLATES LXXXI.-LXXXIII. Development of the embryo- 

 sac and its contents in Monotropa Hypopitys, L. 



PLATES LXXXIY.-XC. Structure and development of Mar- 

 chantia polymorpha } L. 



