468 
Holden and Daniels. — Observations on the 
Figs. 30-42. Figs. 30-34 show the transition in a ‘Type 2 ’ seedling in which tetrarchy has 
resulted from the production of one new pole and the independence of one lateral. The new pole 
does not give rise to a lateral root at the base of the hypocotyl. Figs. 35-3S show a ‘Type 1 ’ 
seedling with similar transition features, a , b, c, d poles, represented in the hypocotyl, e pole present 
from the base of the tap-root onwards. Note the single axillary bud. Figs. 39-42 show the 
transition in a ‘ Type r ’ seedling, in which the three hypocotyledonary poles, a , b, c, are reinforced 
in the tap-root by two additional ones, d , e. 
