334. REPORT—1899. 
whom he mentions as having investigated ultra-violet absorption spectra, 
that certain work by Hartley and Huntington was in error attributed 
to him.! 
Naphthalene. 
‘128 gram, or 1 milligram molecule, in 20 ¢.c. of alcohol. 
With 5, 4, and 3 mm. the spectrum is continuous to 1/A 3151. 
With 3 mm, an absorption band (1) appears from !/\ 3194 to 3228, and 
a second absorption band (2) from +/A 3249 to 3297 ; with 2 mm. both 
bands are still seen. With 1 mm the band (1) has narrowed somewhat, 
and the second band (2) has disappeared. 
1 mill. mol. in 100 c.c. alcohol. 
With 5, 4, and 3mm. the band (1) is still seen from 1/A 3204 to 
3228. 
A third absorption band (3) also appears from !/\ 3359 to 3379. 
With 2 mm. the band (3) still persists, while a fourth band (4) from 
1/\ 3439 to 4259 appears. 
With 1 mm. only the band (4) is seen, band (3) having disappeared. 
1 mill. mol. in 500 c.c. alcohol. 
With 5, 4, 3, and 2 mm. the absorption band (4) is still seen; it 
gradually narrows as the thickness of the layer is diminished. With 
1 mm. the absorption band (4) has disappeared. 
Ortho-vylene. 
1 mill. mol. in 20 c.c. alcohol. 
With 25 and 20 mm. the spectrum is continuous !/\ 3611, but weak 
towards the violet end. With 15 mm. an absorption band appears 
from 1/\ 3611 to 4331, and persists until the layer is only 2 mm. thick. 
With 1 mm. the absorption band has disappeared and the spectrum is 
continuous to !/A 4426°7. 
Meta-xylene. 
1 mill. mol. in 20 c.e. alcohol. 
With 25, 20, and 15 mm. the spectrum is continuous to !/\ 3580. 
With 15 mm. there is a faint prolongation to !/A 3611. With 10 mm. 
an absorption band appears from 1/A 3611 to 4331. This band persists 
until a thickness of 2 mm. is reached. With 1 mm. the band has 
disappeared. 
Para-vylene. 
1 mill. mol. in 20 c.c. alcohol. 
With 25, 20, and 15 mm. the spectrum is continuous to !/\ 3537. 
With 15 mm. there is a faint prolongation to+/A 3580. With 10 mm. 
an absorption band (1) appears from !/A 3580 to 4331. This band is 
still seen when the: layer is-1 mm. in thickness. With 1 mm. a second 
absorption band (2) also appears from '/A 3701 to 3890. 
1 mill. mol. in 100 c.c. alcohol. 
With 5, 4, 3, and 2 mm. the two absorption bands are still seen: (1) 
from 1/X 3611 to 3701; (2) from 1/A 3701 to 3890. With 1 mm. 
both bands have disappeared and the spectrum is continuous to !/\ 
4426-7. 
1 Chem. News, 1891, vol. Ixiii. p. 309; 1891, vol. lxiv. pp. 10 and 212. 
