GASEOUS SPECTRA IN VACUUM TUBES. 105 
APPENDIX -L. 
SEPARATE TABLES OF OBSERVATIONS OF EACH OF 20 GASES. 
Series of 20 End-on Tubes, observed in 1879 and 1880 with Aurora spectroscope, small dispersion 
(1 prism of 52° refracting angle of white flint, having 3°°3 Disp. from A to H), and small intensity of 
sparks (generally under 1 inch long, and latterly under 0°3 inch, but from an ordinary so-called 
2-inch spark induction coil purposely reduced in intensity by replacing its outer helix of long thin 
wire, with another of thicker wire and less length ; bichromate battery of 5 pots, the zincs measuring 
2"°5 x 4” each). 
| 
Names of the assumed Names of the Compounded 
Tube Fillings, Symbol. | Elemental. Compound. infecienia! 
; ; at Nitrogen, Oxygen, Watery 
oan é ; ; . | N+0+4&e. es Mixture } Vapour, &e, 
Alcohol, . , : . : C,H,O ss Compound Carbon, Hydrogen, and Oxygen 
Ammonia, > : P é NH, ane Compound Nitrogen and Hydrogen 
; F Carbonic Oxide and more 
1 
Carbonic Acid, F : : co, bad Compound Oxygen 
Carbonic Oxide, 7 A ; CO si Compound Carbon and Oxygen 
Chlorine, , j : é Cl Elemental 
} Cyanogen (old), .. 0 ; CN ma Compound Carbon and Nitrogen 
Cyanogen (very old), - : CN ‘A Compound Carbon and Nitrogen 
Cyanogen (second example), . CN i Compound Carbon and Nitrogen 
| Hydrochloric Acid, . . . HCl ape Compound Chlorine and Hydrogen 
Hydrogen, : é : ; H Elemental 
| Iodine, . F : : : I Elemental 
Marsh Gas, 5 : 9 CH, ay Compound Carbon and Hydrogen 
| Nitrogen, é : + Se Sf Elemental 
| Nitrous Oxide,. 0 : N,O mee Compound Nitrogen and Oxygen 
| Olefiant COs) chet Sane C.H, ea Compound Carbon and Hydrogen 
| Oxygen, . : . : ; (0) Elemental 
Ozone, . d - : ; O; Elemental Allotropic 
Salt-water, : F 4 ‘ H,0+Na na Compound and Mixture Hydrogen, Oxygen, and Salt 
Water, . : : ‘ : H,O San Compound — ‘ : Hydrogen and Oxygen 
VOL. XXX. PART I. R 
