918 
MR. W. CROOKES OK RADIANT MATTER SPECTROSCOPY. 
Parts. 
Pink coral (one particular specimen) . 
One part of yttrium in 
200 
Strontianite. 
3? 
33 
500 
Stilbite.. 
33 
33 
500 
Hydrodolomite, from Vesuvius ..... 
One 
3 3 
33 
500 
Witherite . .. 
3 3 
33 
1000 
Arranonite .. 
O 
. One 
J3 
3 3 
2000 
Chondrodite (Humite), from Vesuvius. 
. One 
33 
33 
4000 
Egyptian syenite (Cleopatra’s Needle) 
One 
33 
’3 
7000 
Calcite ............. 
33 
33 
10,000 
Natrolite .. 
One 
33 
33 
10,000 
Ox bone.. 
One 
33 
33 
10,000 
Meionite (Vesuvius). 
One 
33 
3 3 
10,000 
Meteorite (Alfianello, Feb. 16, 1883) . 
One 
33 
3 3 
100,000 
Brevicite. 
One 
3 3 
3 3 
200,000 
Prehnite. 
33 
33 
500,000 
Thomsonite. 
3 3 
33 
500,000 
Vesbine, mixed with lava, from Vesuvius 
One 
33 
33 
700,000 
Dolomite. 
33 
33 
1,000,000 
Tobacco ash... 
33 
33 
1,000,000 
Leucite, from Vesuvius ....... 
Less than one 
33 
1,000,000 
Nepheline, from Vesuvius. 
Meteorite (Dhurmsala, 1860). 
Analcite. 
Phenakite. 
None 
Chrysolite. 
None 
Hatiynite. 
Turquoise .. 
None 
Indications of other spectrum-yielding elements. 
89. Throughout the course of this paper I have devoted myself only to the citron- 
band spectrum. I do not, however, wish it to be thought that no other spectra were 
obtained. On the contrary, I have repeatedly seen indications of another very 
beautiful spectrum characterised by a strong red and a double orange band, and, more 
rarely, of a third spectrum distinct from the other two. These I am investigating, 
but not yet having obtained definite results I forbear from saying any more about 
them. I hope that they may bear sufficiently good fruit to be worthy of presentation 
at some future time to the Royal Society. 
