HERMANN VON HELMHOLTZ From an engrasing by C.H. Jeens, 1867, kindly lent by Messis. Macmillan & Co. Ltd

HENRY J. WATT
1921 Music & Letters  
doi:10.1093/ml/ii.3.235 fatcat:r5qrk5ej6zbhvjm2tpgloknpsa