1897 - 98 .] Dr Lloyd on Analysis of Tracings of Vowels. 117 
REFERENCES. 
Y. Hensen. — “ Gehor,” being vol. iii. pt. 2 of Hermann’s Hand - 
buck der Physiologie ; Acoustic Principles, pp. 1-20; An- 
alysis of Sounds, pp. 77-88. 
Everett. — Vibratory Motion and Sound (Longmans). 
Donkin. — Acoustics (Clar. Press), “ Fourier’s Theorem Proved,” 
pp. 65-71 ; “ Fourier’s Theorem Illustrated,” pp. 56-65. 
H. Pipping. — “ Ueber die Tonfarbe der Yocale ” ( Zs . fur Biologie , 
vol. xxvii. p. 1), being detailed analyses of twenty-four vowel- 
phonograms ; “ Zur Lehre von den Yocalklangen ” {ibid., 
vol. xxxi. pp. 524-583), containing controversy with Her- 
mann as to real meaning of Fourierian analysis ; “ Ueber 
die Theorie der Yocale ” {Acta Societatis Scientiarum 
Fennicce, vol. xx. pt. 11), replies to Lloyd {v. infra), and 
gives more analyses. 
L. Hermann. — “ Phonophotographische Untersuchungen,” i.-v. 
(Pflilgers Archiv., vol. xlv. p. 582 ; xlvii. pp. 44, 
347 ; liii. p. 1 ; lviii. p. 255), contain many analyses 
and much controversy about Fourierian analysis ; No. 2 
contains a method of lightening the labour of these analyses. 
“ Bemerkungen zur Yocalfrage ” (ib., vol. xlviii. p. 181); 
“ Yocale im Telephon und Microphon ” {ib., vol. xlviii. 
p. 543); “Weitere Untersuchungen liber das Wesen der 
Yocale” {ib., vol. lx. p. 169), deals chiefly with short 
(German) vowels. 
R. J. Lloyd. — “ Reply to Pipping’s Review of the Author’s 
Articles on ‘ Speech-Sounds ’ in Phonetische Studien , 
1890-2 ” {Zs. fur franzdsische Sprache , vol. xvi. p. 201) ; 
“ The Genesis of Yowels ” {Journ. of Anat. and Physi- 
ology, vol. xxxi. p. 233) ; “ Interpretation of the Phono- 
grams of Yowels ” {Journ. of Anat. and Physiology , voh 
xxxi. p. 240). 
