VI 



CONTENTS. 



XIII. Mean Tones, Equal Tempered Tones, and the Harmonic 



Tetrachords of Claudius Ptolemy. By R. C Phillips pp. 

 (I ssiied separately. May 2}id, igo^.) 



XIV. The Constitution of the Ammonium Compounds. By J. C 



Cain, D.Sc pp. 



(^Issued separately. May ^th, i(po4.) 

 XV. Notes on some Polyclad Turbellaria in the British Museum. 

 By F. F. Laidlaw, B.A pp. 



{Issued separately. May gth, IQ04..) 

 XVI. Note on the Union of Hydrogen with Sulphur, Selenium, 

 and Tellurium. By Francis Jones, M.Sc, F.R.S.E. pp. 



{Issued separately, May gth, igo^..) 

 XVII. On the Electrolytic Methods for the Detection and Approxi- 

 mate Estimation of Minute Quantities of Arsenic in Beer, 

 Malt, and Foodstuffs, etc. By W. Thomson, F.R.S.E., 



F.I.C. Plates VII.— X. pp. 



{Issued separately, May 14th, igo4.) 



XVIII. On the Discovery of Elephas Antiquus at Blackpool. By 

 W. BoYD Dawkins, M.A., D.Sc, F.R.S pp. 



{Issued separately. May 21st, igo4. ) 

 XIX. Tables of the Bessel Functions for Pure Imaginary Values 

 of the Argument. By J. G. Isherwood, B.Sc. ... pp. 



(Issued separately. May 2Jth, igo4. ) 



XX. Note on the Eye of the Mole. By F. A. Bruton, 

 M.A pp. 



(Issued separately, June lOth, igo4.) 

 XXI. A Diagnostic Key to the Genera of Recent Dibranchiate 



Cephalopoda. By W. E. Hoyi.e, D.Sc pp. 



(Issued separately, June 17th, igo4.) 



XXII. The Collection af Apparatus used by Dalton, now in the 

 possession of the Manchester Literary and Philosophical 

 Society. By Francis Jones, M.Sc, F.R.S.E. Plates 

 I.— IX. pp. 



{Issued separately, July 1st, igo4.) 



XXIII. Notes on the Falkland Islands. By Rupert Vallentin. 



Plates I.— III. pp. 



{Issued separately, July ^tht igo4.) 



XXIV. On the Bearing of Mendelian Principles of Heredity on 



Current Theories of the Origin of Species. By A. D. 

 Darbishire, B.A pp. 



(Issued separately, July nth, igo4.') 



XXV. The Hymns to Tammuz in the Manchester Museum, Owens 

 College. By T. G. Pinches, LL.D., M.R.A.S. Plates 

 I.— VII. pp. 



(Issued sepa7-ately, July 28th, igo4.) 



1—6 



I— S 



I— 14 



1—4 



1—3 



1—5 



1-5 



I— 19 



1—32 



