904 
MR. W. CROOKES ON RADIANT MATTER SPECTROSCOPY: 
Name. 
Mosandrum 
Philippium ( 13 ) 
"Rogerium( 13 ) . 
Samarium . 
Scandium . 
Terbium 
Thorium 
Thulium 
Ytterbium . 
Yttrium 
Yttrium a . 
Yttrium /3 . 
Zirconium . 
Absorption 
Spectrum. 
Hydrogen 
equivalent of 
Metal. 
(Type of Oxide 
M 2 0). 
No 
5T2( n ) 
No 
— 
Yes 
— 
Yes 
50-0( 14 ) 
No 
14 - 7 ( 15 ) 
No 
49-5( 10 ) 
No 
58-4 
Yes 
56-5H 
No 
57'9( 18 ) 
No 
29-7( 19 ) 
No 
52-2( 20 ) 
Yes 
4.9‘7 ( 21 ) 
No 
22-5 
( n ) Lawrence Smith, ‘ Comptes Rendus,’ vol. lxxxvii., pp. 145, 146, 148. Marignac, ibid., vol. 
lxxxvii., p. 281. Delafontaine, in October, 1878 (ibid., vol. lxxxvii., p. 600), considers mosandrum a 
mixture of terbium, yttrium, erbium, didymium, and pbilippium. Subsequently, however, Lawrence 
Smith, in November, 1878 {ibid., vol. lxxxvii., p. 831), adduces chemical and other reasons to show that 
his mosandrum is not a mixture, but a true element. A year later, September 1, 1879 {ibid., vol. 
Ixxxix., p. 480), Lawrence Smith repeats the claim for mosandrum to be classed with the elements. 
( 12 ) Delafontaine, ‘Comptes Rendus,’ vol. 87, p. 559; Chemical News,’ vol. 38, p. 202; ‘Jour. Chfem. 
Soc.,’ vol. 36, p. 116. 
( 13 ) See Note ( 3 ) to Columbium, ante. 
( 14 ) Lecoq he Boirbaudran, ‘ Comptes Rendus,’ vol. lxxxviii., p. 322, and vol. Ixxxix., p. 212; 
‘Chemical News,’ vol. xxxix., p. 115, and vol. xl., p. 99. Brauner, ‘ Chemical News,’ vol. xlvii., p. 175 ; 
Cleve, ‘ Comptes Rendus,’ vol. xcvii., p. 94 ; ‘ Chemical News,’ vol. xlviii, p. 39. 
( 15 ) Nilson, ‘Comptes Rendus,’ vol. xci., p. 118; ‘Chemical News,’ vol. xlii., p. 83. Cieve, 
‘ Comptes Rendus,’ vol. Ixxxix., p. 419; ‘ Chemical News,’ vol. xl., p. 159. 
( 16 ) Marignac, ‘Ann. Chim. et Phys.,’ ser. 5, vol. xiv., p. 247; ‘Journ. Chem. Soc.,’ vol. xxxvi., 
p. 113. Delafontaine, ‘Ann. Chim. et Phys.,’ ser. 5, vol. xiv., p. 238 ; ‘Journ. Chem. Soc.,’ vol. xxxvi., 
p. 114. 
( 17 ) Cleve, ‘ Comptes Rendus,’ vol. Ixxxix., p. 478, and vol. xci., p. 328 ; ‘ Chemical News,’ vol. xl., 
p. 125, and vol. xlii., p. 182. Thalen, ‘ Comptes Rendus,’ vol. xci., p. 376; ‘ Chemical News,’ vol. 
xlii., p. 197. 
( 18 ) Marignac, ‘ Comptes Rendus,’ vol. lxxxvii., p. 578 ; ‘ Chemical News,’ vol. xxxviii., p. 213. 
Nilson, ‘ Comptes Rendus,’ vol. lxxxviii., p. 642, vol. xci., p. 56 ; ‘ Chemical News,’ vol. xlii., p. 61. 
( 19 ) Cleve, ‘ Comptes Rendus,’ vol. xcv., p. 1225 ; ‘ Chemical News,’ vol. xlvii., p. 4. ‘ Bull. Soc. 
Chim.,’ vol. xxxix., p. 120; ‘ Chemical News,’ vol. xlvii., p. 143. 
( 20 ) Marignac, ‘ Comptes Rendus,’ vol. xc., p. 899 ; ‘ Chemical News,’ vol. xli., p. 250. 
( 21 ) This is almost certainly identical with Lecoq de Boisbaudran’s samarium. See Marignac, 
‘ Comptes Rendus,’ vol. xc., p. 899 ; ‘ Chemical News,’ vol. xli., p. 250. Soret, ‘ Comptes Rendus,’ 
vol. xci., p. 378 ; ‘Chemical News,’ vol. xlii., p. 199. 
