ON SOME CASES OF INVERSION. 387 
rr are is upper surface of the leaf, associated i a twist of 
the is witnessed in Alstrwmeria, Bomarea, various species of 
res es other monocots. No change occurs in chai cases, in 
the relative position of the xylem and a oem. 
INVERTED DISTRIBUTION OF COLOUR. 
In a flower of an ordinary Glowinia the richest colouration 
occurs in the interior of the tube, in a position corresponding to the 
ventral surface of the leaf. Occasionally petaloid outgrowths arise 
from the outer surface of the ordinary corolla, these outgrowths 
being sometimes so regular as to form a second corolla outside the 
first. In these enations the deep colour is si The thick 
er ones the paler portions these 
cases the en os on forms, th apr nara of its 
margins, a complete tube, and when that is the case, 
the deepest intensity of colour is ‘nadie, as in the 
Similarly a ‘peculiar malformation occurs rad 
in Calceolaria in which, in additi the usual t 
stamens, a third is developed in the form of a petaloid 
bag or tube within the corolla, and coloured in the same 
manner, except that whilst in the corolla the deepest aie p ier is out- 
side, in the petaloid stamen it is insi 
INVERSION OF THE FLOWER. 
In most sede the oath in the adult flower are so arranged 
that one is posterior and median, the other two are lateral, on 
* The examination of Calceolarias presenting the Poe ars men- 
tioned, induced me to study the m : ode of de evelopm ent of the flow The 
prim 
flower is therefore numerically haetes from the oer yee 
trace of the fitth ave or petal, nor of the three stamen Bichler stnibutes 
the fourfold calyx to the union, or want of separation of rts sepals, but there 
is no trace of fusion of two sepals. 
