A. M. Mayer—Floating Magnets. 253 
center. Thus, 56 exceeds in area 5a, and 6a is of greater area 
than 6. To see the effect of a repulsive center on a configura- 
tion, compare the areas of the two squares 4 and 5d, and of the 
two pentagons 5a and 6a. e most marked effect of a repul- 
sive central magnet is seen on comparing 14 with 15. e 
actual centralization of atoms in the molecule when a y 
expands in solidifying, and in the case where of two or more 
of crystallographers. : 
(8.) Illustrations of Allotropy and Isomerism.—The most inter- 
esting of our experiments with the floating magnets are thos 
formed of the same number of magnets. Take figures 5a and 
- The first is a pentagon. The second is a square with a 
Magnet in its center. The forces in these floating magnets and 
a ' 
| | ed in 
water whose surface was at a constant perpendicular distance 
