72 THE ROYAL SOCIETY OF CANADA 



Conditions comparable with those above described have been 

 observed to produce similar results. Hus^ has pointed out that, 

 after a rain at an unusual time of the season (September, 1904), at 

 Berkeley, Calif., an abnormally large number of teratological cases 

 were to be met with, notably fasciations. Hus went further and 

 found it possible, by alternating drought and abundant watering 

 to produce fasciations at will, and adopted the explanation of Gœbel,- 

 that, as indicated by growing experiments, this result is due to the rapid 

 introduction of sap into the buds, that is to say, by excessive growth of 

 crowded parts. The frequent exigencies of garden and glass-house 

 culture, resulting in alternation of physiological drought periods with 

 plenitude of water, appear to be equally responsible for the production, 

 of ascidia, judging from the number of plants which produce them 

 under such conditions, as noted by Harris.^ Other form changes, 

 which need not perhaps be relegated to any category of the abnormal, 

 seem also to be called forth by environmental changes. Stout* 

 found that in Coleus deeply laciniate leaves were produced during 

 winter or after pronounced drought during summer.^ 



The material afforded by the cotton-plants grown as above 

 described can be arranged in a short series of cases between which 

 numerous intermediate conditions were found, to describe which would, 

 however, be superfluous. 



Case 1. (figure 1). Lateral curvature of blade, unequal develop- 

 ment of external lobes, constriction of chief lobe chiefly on one side, 

 accompanied by deep sinuses and foldings. Internal lobes^ suppres- 

 sed: on the left the proximal moiety of an ascidium at end of vein to 

 internal lobe on that side. On the right a deep notch, the approxi- 

 mated chief and adjacent lobes confluent by the dorsal (lower) faces, 

 a cicatrix-like^ tract leading to the base of the leaf. A section through 

 g-h appears as in figure 12a; through e-f as in figure 12b; through c-d, 

 as in figure 7. 



Case 2. (figure 2). Constriction of the middle region accompanied 

 by partial suppression of contiguous regions of external lobes and 



^Hus. H. Fasciation in Oxalis crenata and experimental production of fasciations 

 Kept. Mo. Bot. Gard. 17:147-152, 1906. 



"Organography Vol. 1, p. 190. 



'Harris, J. A., Ascidia in Gfw/erza and Agav. Rept. Mo. Bot. Gard. 17:126- 

 132, 1906. 



*Stout, A.B. The establishment of varieties in Coleus by the selection of 

 somatic variations. Carn. Inst. Wash. Publ. 218. 



^See also other instances cited by Gœbel, I.e. p. 190-191. 



^The five lobes of the cotton leaf are here termed the chief (median), internal 

 and external (lateral) lobes. 



'Cicatrix is used for the visible line of concrescence of two lobes. 



