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PHYSICS: J. P. MI N TON 
Proc. N. a. S. 
least consistent with the data for BeO. In both cases there should be 
different properties in the two directions of the hexagonal axis. 
The fact that c/a is greater for Zn than for Be, but less for ZnO'than BeO 
is hard to explain unless we assume a considerable rearrangement of elec- 
trons to take place during the formation of one of the oxides. It is inter- 
esting to note that another substance which possesses this structure is 
ice, 2^ which tempts one to regard frozen water as an oxide of the formula 
(0H4)0, the radical OH4 being divalent, just as NH4 is univalent and CH4 
is saturated. 
^ O. Honigschmidt and L. Birckenbach, Ber. deut. chem. Ges., 55, 1922 (4-12). 
2 G. P. Thomson, Phil. Mag., (6) 42, 1921 (857-867). 
3F. Fichter and K. Jablczynski, Ber. deut. chem. Ges., 46, 1913 (1604-1611); J. S. 
Negru, Chem. and Met. Eng., 21, 1919 (353-359). 
4 M. Polanyi, Z. Physik., 7, 1921 (149-180). 
5 L. W. McKeehan, Frank. Inst. J., 193, 1922 (231-242). 
6 W. P. Davey, Opt. Soc. Amer. J., 5, 1921 (479-493). 
7 W. Duane, Nat. Res. Counc. Bull., 1, 1920 (383-406). 
8 R. T. Birge., Physic. Rev., (2) 14, 1919 (361-368). 
^ P. Groth, Chemische Kristallographie, Leipzig, 1, 1906. C. L. Parsons, The Cherh- 
istry and Literature of Beryllium, Easton, Pa., 1919. 
10 W. Gerlach, Z. Physik., 9, 1922 (184-192). 
11 A. W. Hull and W. P. Davey, Physic. Rev., (2) 17, 1921 (549-570) ; W. P. Davey, 
loc. cit. 
12 P. Groth, loc. cit. 
1* C. Iv. Parsons, loc. cit.; F. Fichter and K. Jablczynski, loc. cit. 
14 A. W. Hull, (Mg) Physic. Rev., (2) 10, 1917 (661-696); (Ca) Ibid., (2) 17, 1921 
(42-44); (Zn, Cd) Ibid., (2) 17, (571-588). 
15 L. W. McKeehan and P. P. Cioffi, Ibid., (2) 19, 1922 (444-446). 
16 (MgO) W. P. Davey and E. O. Hoffmann, Ibid., (2) 15, 1920 (333); R. W. G. 
Wyckoff, Amer. J. Sci., (5) 1, 1921 (138-152); (CaO, Sr, BaO) O. Gerlach, loc. cit.; (MgO, 
CaO, SrO, CdO, BaO) P. Groth, loc. cit. 
17 P. Groth, loc. cit. 
18 W. L. Bragg, Phtl. Mag., (6) 39, 1920 (647-651). 
19 J. A. Hedvall, Z. anorg. allg. Chem., 120, 1922 (327-340). 
20 W. H. Bragg, Phys. Soc. London Proc, 34, 1922 (98-103). 
SOME CASES OF NERVE-DEAFNESS AND THEIR BEARING 
ON RESONANCE THEORIES OF AUDITION 
By John P. Minton* 
Rybrson PhysicaIv Laboratory, University of Chicago 
Communicated June 8, 1922 
1. Introduction. — The present paper deals with certain cases of nerve- 
deafness and their bearing on the mechanical resonance theories of tone 
perception. The paper is thus a continuation of a recent one published 
in the February issue, 1922, of the Physical Review and like the earlier 
