92 Canadian Record of Science. 



as io form and size, and exhibited three normal carpels in 

 the pistil. There were, however, seven stamens instead of 

 six, and seven divisions of the perianth instead of six. The 

 addition of an extra number to each of these whorls of 

 organs was found, upon examination, to be a result of 

 chorisis or deduplication, an alteration which is by no 

 means rare, but which leads to the breaking up of a nor- 

 mally single organ into two or more organs of the same 

 kind. The most marked change, and one which is com- 

 paratively rare, was to be found in the presence of a bract 

 below the flower. This organ was found to arise from the 

 scape at a distance of about one and one-half inches below 

 the flower. It was two and one half inches long and one- 

 half inch wide. One margin, for a width of about one- 

 eighth of an inch, was distinctly petaloid, showing the 

 tendency for this organ to become a true spathe. This 

 case has more recently been paralleled by the occurrence 

 of a double calla lily, in which a second spathe of full size 

 and form was developed below the normal spathe at a dis- 

 tance of about one inch. 



In a flower of the common fuchsia all parts were normal 

 with the exception of one calyx lobe, which had developed 

 into a perfectly normal leaf except along one margin, where 

 it remained attached to the adjoining sepal. 



In the common pelargonium one flower was completely 

 replaced by a branch bearing well-developed and normal 

 leaves. 



Eoses under cultivation often exhibit interesting condi- 

 tions of reversion in the flower, iess frequently do they 

 show them in the leaves. Two specimens in our collection 

 give a clear indication of the reversion of a compound leaf 

 to the simple form of that organ. The specimens are of the 

 common wild rose {Rosa Carolina). In one case the flower 

 is normal, and only one leaf shows reversion. Here the 

 five normal leaflets are replaced by two leaflets. The basal 

 one of these shows from its position that its opposite was 

 arrested in development. The terminal leaflet shows three 

 strong lobes, with a prominent vein running into each, so 



