296 TRANSACTIONS OF THE [Sess. lxxviii. 



from day to day in the Normal. In the Intermittent and 

 Light conditions the growing region curve flattens towards 

 the end, while in the Dark the growth curve decreases, then 

 increases and decreases again, while the curve of the grow- 

 ing region decreases and then flattens out. 



6. The growing regions, as well as the growth increase 

 of root and shoot, show a similar correlation, i.e. they vary 

 inversely. 



Note on Phyllody and Diatropism in the Primrose. 

 By Miss Flora M. Scott, M.A., B.Sc. (Plate XX.) Com- 

 municated by R. A. Robertson, M.A., B.Sc. 



(Bead 11th June 1914.) 



In Mount Melville Woods I found a curious "thrum- 

 eyed" sporting form of Primula vulgaris, Huds. It was 

 growing at the foot of a steep bank near the valley of a 

 small stream, in a stiff clay soil. The undergrowth was 

 scanty, consisting mainly of primroses and ferns. The 

 primroses, with this one exception, were normal. 



The sporting plant was large and well grown, and was 

 noticeable at a glance on account of the remarkable habit 

 of the flowers. The calyx was leafy, and the corolla, 

 normally oriented in bud, assumed a horizontal position 

 on further development, being bent over at the base of 

 the corolla tube. A flower, normally radial, had thus 

 assumed directly zygomorphic symmetry. Along with 

 zygomorphy was associated a certain amount of irregularity 

 in the floral envelopes. 



The number of sepals varies from five to seven, the most 

 usual number being six. They are foliose, and are differ- 

 entiated into leaf-base and lamina. The leaf-bases in bud 

 are connate, and are united by a thin colourless membrane, 

 three to five cells thick. The outer and inner epidermis 

 of the latter are continuous with those of the leaf-base. 

 The middle layer is non - chlorophyllous parenchyma. 

 On further development of the flower, chorisepaly occurs, 

 resulting in the complete freedom of one or more sepals. 

 The laminae are lanceolate, and in general appearance and 

 venation resemble the primrose leaf. There is a certain 



