676 SYMMETRICAL FIGURES IN BIRDS’ FEATHERS. 
had been swiftly drawn in opposite directions, sometimes at right 
angles but frequently at angles more acute. Probably, at the 
moment of trans:tion from a fluid to a solid condition, the trans- s 
parent centred, or nucleated, cells assumed the form of a square, 
Fig. 119. 
b & & : ; 
- Pie Q f 
Fl ae yt yt Po 
3 
9 m Qa : 
: oc gO S @ as 
See 
Symmetrical Figures in Birds’ Feathers. 
a lozenge, a starry hexagon, a erdss, or any other beautiful figure 
which could be formed of the parts which suddenly appeared in 
the spherical cells, these parts seeming at first, in some instances, i 
at least, to consist of m‘nute triangles. : 
At the same moment the little granules moved to order, and. 73 
