ABSORPTION SPECTRA AND CHEMICAL CONSTITUTION. 337 
Tetrahydroquinoline. 
‘133 gram in 20 c.c. alcohol. 
With 5, 4, 3, 2, and 1 mm. the spectrum is continuous to 1/A 3008°5. 
‘133 gram in 100 c.e. alcohol. 
With 5 and 4 mm. the spectrum was continuous to }/A 3073. With 
3, 2, and 1 mm. an absorption band appeared from '/\ 3151 to 3647, 
which got narrower as the thickness of the layer of liquid was reduced. 
‘133 gram in 500 c.c. alcohol. 
With 5 mm. the absorption band had disappeared and the spectrum 
was continuous to !/A 3647. With 4, 3, and 2 mm. an absorption band 
appeared from !/A 3701 to 4331, which got narrower as the thickness 
of the layer of liquid was reduced. 
With 1 mm. the absorption band had disappeared and the spectrum 
extended to 1/d 4566, but was somewhat weak towards the violet end. 
Tetrahydroquinoline Hydrochloride. 
‘1695 gram in 20 e.c. alcohol. 
With 10, 9, 8, and 7 mm. the spectrum is continuous to 1/\ 3008 
With 6, 5, 4, 3, and 2 mm. an absorption band appears from 1/A 3080 to 
3574, which gets narrower as the thickness of the layer of liquid is 
reduced. With 1 mm. this absorption band has disappeared, but another 
appears from !/\ 3647 to 4331. 
‘1695 gram in 100 c.c. alcohol. 
With 5, 4, 3, 2, and 1 mm. an absorption band appears from 1/A 
3647 to 4331. 
1695 gram in 500 c.c. alcohol. 
With 5 and 4 mm. an absorption band appears from 1/\ 3647 to 
4331. With 3 mm. the absorption band has disappeared, and the spec- 
trum extends to !/\ 4426-7. 
Ortho-toluidine Hydrochloride. 
‘107 gram dissolved in 20 ¢.c. of alcoholic solution of HCl. 
With 5 and 4 mm. the spectrum was continuous to 1/X 3647. With 
3 and 2 mm. an absorption band appears from '/A 3701 to 4426-7. 
With 1 mm. the absorption band disappears, and the spectrum is con- 
tinuous to 1/A 4547-5. 
Para-toluidine. 
‘107 gram in 20 c.c. alcohol. 
With 5, 4, 3, 2 and 1 mm. the spectrum is continuous to !/A 3080. 
‘107 gram in 100 c.c. alcohol. 
With 5, 4, 2 and 2 mm. an absorption band appears from 1/A 3151 
to 3701, which gets narrower as the thickness of the layer of liquid is 
reduced. With 1 mm. the absorption band disappears, and the spectrum 
is continuous to !/\ 3890. 
‘107 gram in 500 e.c. alcohol. 
With 5, 4, and 3 mm. the spectrum is continuous to !/\ 3930. With 
2 and 1 mm. an absorption band appears from '/\ 3890 to 4426. It is 
slightly narrower with the 1 mm. layer. 
‘107 gram in 2,500 e.c. alcohol. 
With 5 mm. an absorption band appears from 1/A 4033 to 4331. 
1899. ; Zz 
