344 
Proceedings of the Royal Society of Edinburgh. [Sess. 
in the Handbuch dev Biologie gives it as between 314° and 318°. The present 
preparation was so far decomposed at 270° that I was unable to ascertain 
the actual melting point. In each case the estimation was made in 20 c.c. 
reagent, using the J-inch cell for the reading. 
The following readings were obtained : — 
012 
gm. tyrosin gave 
readings 
8-0, 
7-8, 
7-6 
Average. 
7-8 
010 
5 } 
33 
6*6, 
6-4, 
6-6 
6-53 
008 
35 
33 
5-2, 
5*1, 
5-0 
5-1 
007 
33 
33 
4-5, 
4*4, 
4*4 
4-43 
006 
33 
33 
3*8, 
3-8, 
3*7 
3-76 
005 
33 
33 
3-0, 
3'0, 
31 
3-03 
004 
33 
33 
2-4, 
2-3, 
2-4 
2-36 
From these results a curve may be obtained which, within these limits, 
gives a straight line. This, although coming very near to the starting 
o/i 
o/o 
$ OO-j 
o 
ooC 
o 
00 i 
004. 
V 
3 * s 
3 
point, does not actually pass through it. Whether this is due to inaccuracies 
in the readings, or whether, as was suggested by some readings taken with 
lower concentrations using a wider cell, the curve is really of hyperbolic 
nature, could not be determined. For practical purposes, however, the 
