Five-leaved Clover 367 



the latter part of the season, and as these organs 

 may be developed to very different degrees, 

 they afford fine material for the study of the 

 law of periodicity. On a garden-cytisus 

 (Cytisus candicans attleyanus) I once had the 

 good fortune to observe a branch with ascidia, 

 which ordinarily are very rare in this species. 

 It had produced seven ascidia in all, each 

 formed by the conversion of one leaflet on the 

 trifoliolate leaves. The first six leaves were 

 destitute of this malformation and were quite 

 normal. Then followed a group of fL\e leaves, 

 constituting the maximum of the period. The 

 first bore one small pitcher-like blade, the sec- 

 ond and third, each one highly modified organ, 

 the fourth, two ascidia, and the last, one leaflet 

 with slightly connate margins. The whole 

 upper part of the branch was normal, with the 

 exception of the seventeenth leaf, which showed 

 a slight change in the same direction. All in 

 all, the tendency to produce ascidia increased 

 from the beginning to the tenth leaf, and de- 

 creased from this upward. 



The European Venus' looking-glass was ob- 

 served in my garden to produce some quater- 

 nate and some quinate flowers on the same spec- 

 imens. The quinate were placed at the end of 

 the branches, those with four petals and sepals 

 lower down. The peloric fox-glove shows the 



