438 ELONGATION OF 
the lobes or leaflets become separated one from another 
bya kind of apostasis. This change may be frequently 
seen in the horse-chestnut, particularly in the young 

Fra. 207.—Portion of leaf of parsley, showing the change from short 
wavy to long flat leaf-lobes. 
shoots formed after the trees have been pruned or 
pollarded. In the adjoining cut the intermediate stages 
between a palmate or digitate leaf to a pinnate one 
may be seen. The specimens from which the drawing 
was made were taken from the same tree at the same 
time. 
In the white clover, Trifolium vepens, a similar tran- 
sition may often be observed, as also in some species 
of Potentilla.' 
Elongation of the parts of the flower—The only circum- 
stance that needs especial mention under this section 
is the great lengthening that sometimes takes place in 
1 Schlechtendal, ‘Bot. Zeit.,’ 1844, p. 457; ‘Linnea,’ xi. p. 301, xiv, 
p. 363 ; ‘Bot. Zeit.,’ 1856, p. 72 ; Masters, ‘ Rep. Brit. Assoc.,’ Manchester, 
1861; Coultas, ‘What may be learnt from a tree,’ p. 11S. 
