1368 
even > /, and zero for those with odd ZA) have been taken into © 
consideration. Hence absorption in the rod, temperature factor, and 
polarisation factor are not taken into account. We hope to ascertain 
in how far anything can be concluded with regard to the configu- 
TABLE II. 
Intensity 
Planes 
Observed | Calculated 
100 — 
110 zs 6.0 
111 — aa 
200 m 1.5 
210 = ae 
211 = 4.0 
220 ms 1.5 
221 
300 | ie is 
ration of the electrons outside the nucleus after photometry of the 
film. It can, indeed, already be stated that it is not possible to satisfy 
the erystallographical and intensity conditions by a model, in which 
by the side of the Li-ion, the valency-electron occupies a definite 
place in the space-lattice. We tested the arrangement which may be 
obtained in the following way, and which is .the only one that 
deserves consideration : 
Draw the system of non-intersecting trigonal axes in the cell with 
edge a’ = 2a and place the valency-electron on each axis in the 
middle between the ions. That the intensities calculated for this 
model are not in agreement with the observed intensities appears 
from table III (supposition B; the effect of the distance of the 
remaining electrons from the nucleus can be neglected in this case.) 
On the other hand agreement with the observed intensities 7s 
found, when in this model the valency-electron is placed not on 
the trigonal axis, but revolving in circles normal to the trigonal 
axis in the midst of the Li-ions (Table III, supposition C); here r 
= radius of the path supposed circular. The weakening factor occur- 
