ORGANIZATION OF SOLS 



13 



• ••••• 



• c • • • 



• •/ " • ^ ^« • • 



• / • • ^ • • 



• I* • •! • • 



• V • • / • • 



• • • • • 



• o • • • • 



• • • '/"'-^^ 



• • • •/ • • 



• « • • -V _•__ ^ 

 • ••••• 



• • • •! • •••••••••• 



• ••••/*•••*. 



• • • •.• ^ • • • f^M • • • ^ 



• •••!••• •••'••••9' 



, I ^_,/ 



I 1 ^ 



• • •(• •••••••• •!• • 



I I 



I I 



Fig. 3 



Fig. 4 



Fig- 5 



Fis. 6 



Fig- 7 



Homogeneous arrangements 



Fig. 3. Statistically homogeneous distribution - Fig. 4. Homogeneous isotropic lattice - 



Fig. 5. Homogeneous anisotropic lattice - Fig. 6. Statistically homogeneous distribution 



of polar particles - Fig. 7. Homogeneous lattice arrangement of polar particles. 



rections, in which case the lattice arrangement is anisotropic (Fig. 5). 

 The homogeneous lattice arrangement has in common with the 

 statistically homogeneous arrangement that equal volumes contain 

 an equal number of particles. With anisotropic arrangements it is 

 not sufficient to compare volumes of equal size; they must also have 

 the same orientation. For, if from Fig. 5 instead of circles we draw 

 two congruent rectangles with different orientations, the properties of 

 one of these rectangles will be different from those of the other on 

 account of the different distribution ot lattice points with respect to the 

 length of the rectangle (the linear thermal expansion of the long side 

 of the two rectangles, for instance, will be different). The necessity of 

 taking orientation into account becomes particularly apparent if 



