1369 
ring in this case for the electron’) makes the calculated intensities, 
1 2 
for values of en +01, ie. r > + + of the distance between two 
nuclei, differ but little from those found for case A (simply centred 
cubic lattice; the intensities of column A are not essentially affected 
by taking into account a weakening factor for the Li-atom.) The 
choice between the two models that are in agreement with the Röntgen 
investigation, viz. that with atoms in the lattice points and that with 
ions between which binding circles, will be postponed till after 
photometry of the film ’). 
TABLE III 3) 
Intensity | 
Planes En Lal 
Observed | Calculated 
A B C 
r 
(7=01) 
= = 16 8 
220 zs 216 96 78 
ae ze 14 0 
400 m 54 6 20 
332 CE. 4 ' 
422 Ss 144 64 dig 
431 
| - : 
510 
521 
| ms 54 60 22 
440 
It is, however, very questionable whether a decision can be made 
with sufficient probability along this line, i.a. on account of the un- 
1) Cf. the analogous calculations on binding circles in diamond by Coster. 
These Proc. Vol. 22, p. 536 and KOLKMEYER, Vol. 23, p. 120. 
3) Possibly this choice will be still more difficult here than it is for dia- 
mond, as the number of valency-electrons is here only !/; of the total number. 
3) The planes for which the structure factor becomes zero independent of 
the value of ul have not been included in the table. 
a 
