forcement of 5 young ones, making 13 in all. We need not go 
any further. 
It is not so probable that each additional set should push at once, 
but rather that its elements should appear successively, namely, 
after the rates of pre-extant maturities. 
It is known by microscopic observations (Schacht), that in the 
ran rudimentary foliar cell springs from a previous one. 
ew germs are always produced next to the centre of the 
axis ; iy their growth and expansion the older parts remove to- 
wards the widening periphery, and youmpet ones are 
coming up in the centre, as from a fountain of life. 
A young and tender part (a. beth slaraepe a smaller angular space 
allotted to it than more adult ones, bet when itself arrived at a 
of perfection, the angles become mnpeenan® equally divided. 
Hence the. point in question is not so much the degree of diver- 
gence, but the order of alternation, which ultimately produces cer- 
tain effects of angles. 
_ The néxt question is, how will the ae of genealogical origin 
of foliar elements—hence of their numbers—apply to the law of 
alternations? and what of organological import can be elicited 
from the apparent relations between the - process and the 
ineneinehs form? — 
