GASEOUS SPECTRA IN VACUUM TUBES. 123 
CYANOGEN, Another example of, long laid by unused. Enp on TuBE. 
October 10, 1879. 
=(CIN. 
This tube gives an eminently brilliant and white light to the eye; just as did the former old and much- 
used tube, before it went wrong, became pink in colour, pale and hazy, besides apparently sparking from the 
polar wires inside their glass fixings. In the spectroscope this tube showed 12 grand bands of Carbon, and 41 
lesser of Nitrogen, its proper constituents ; also some Hydrogen, and also Carbo-hydrogen, or Blow-pipe flame, 
lines as impurities, but no Oxygen; and has not been deemed worthy of being printed at length. 
HYDROCHLORIC ACID. January 23, 1880. 
HCl=Hydrogen Chloride. 
“ | Left unclaimed 
' aa, ... | Appear- : se Constituents Cae 
Colour. Subject of Observation. Intensity. | “PP?St | W.N. Place, |) Impuz ties Aicttchited oe ae ie 
Crimson- | Part 1, 
Red. Very clear and distinct line, , 6 1°5 | 34 960 Chlorine 
Broad faint haze, . ; : OS fw 36 162 || Carbon 
Red: Strong band, ; ; ; : 15 Be pe Carbon 
Fainter band, : 1:0 HH ar nee Carbon 
Scarlet-Red. oe a band oe before Red Hato 15 ‘i 38 414 ) Carbon 
DEF | 38 419 
The line or band beginning ast 
before Red Hydtogen, a cee ee Cuaiere 
Red Hydrogen, 5 & 38 742 Hydrogen 
—_—. Bundle of lines in haze : ea sien ane 
ve : ; 1 rb 39 506 Nitrogen 
Light-Red. Thick broad or multiple line, 2 Il 39 715 
40 035 : 
—_— Band, . ; : A : ; 1°5 "40 246 t Nitrogen 
40 8 
Banish. ay Pe Bed eh } 40: ant Carbon ? 
40 676 2 
Band, . : 3 : : : 15 40 oi Nitrogen ? 
Broad line, 2°0 | 41 022 2 Chlorine 2 
Strong line, 2°5 1 41 291 Oxygen ? 
Strong line, . 4 2°5 1 41 466 Chlorine 
Faint narrow band, 13 I 41 588 Chlorine 
Orange, Faint bundle of lines, 1 5 41 731 Carbon? /|+ Chlorine 
Strongest line in a faint bundle 4 Jaern 
accompanied by a Red band, Ze oH: SOREW Seat 
Thin line, 07 | 42 029 
Strong line among ‘thin ones, 2°5 (Mi 42 187 Hydrogen ? 
Close thin lines intervene, mn 
Strong central bundle, . : 2 42 540 Chlorine ? 
Close thin lines intervene, . ‘ mn 
: Hydrogen? 
Bundle of close lines, , 2 HH 42 784 Giilouse 
———_ —__ Thin line, . ‘ . ; 5 1 | 42 919 
A yellow line, slightly b d 
Soi, oy, CL Sete oa 2 | 43 116 2 Hydrogen? ? 
oat Part 3. 
ellow. Bundle of thin lines, after last-ter- | : 
i oan 0-7 my > 48 808 Chlorine ? 
Very thin line, : - : 0°3 | 43 445 
sponse: oey : 1:0 Il 43 506 Hydrogen ? 
xceedingly sharp "bright intrinsi- 
cules 7 fe 8 3 I | 43 702 . 2 Hydrogen 2 
—_-——_ Intervenes a space full of sharp 43 721 “ 
lines, é 4 Oe Ht 44 114 Oulu? 
