( 672 ) 



§ 7 Comparison of the construction with the observation. On the 

 whole this is very satisfactory, taking the degree of approximation 

 into consideration. 



a. In pi. II fig. 4 the diagram for the plait at 5° indicating 

 Kuenen's observations, has been drawn in full lines. The figure 

 contains at the same time that obtained by construction. The single 

 observations have been denoted by Q] (see § 6a). Besides the con- 

 struction with the model indicated by and by \-/, also 



the simplified constructions in the plane indicated by and 



by 0, the outermost of which refers to the less simplified con- 

 struction, represent the character and also the numerical values satis- 

 factorily. 



b. In pi. Ill, fig. 3 the figure representing Kuenen's observations 



for the plait of 20°, has been indicated by . The figure 



contains at the same time the , obtained by construction on 



the model (see § 6b). The correspondence at x = 0.3 is the worst, 

 which is no doubt in connection with this, that here we have already 

 got very near the critical temperature, and that strictly speaking, 

 different values should be assigned to T' (see §2) for all r, and 

 corresponding Av> and Ap should have been taken into consideration. 



c. In pi. IV fig. 3 the figure representing Kuenen's observations, 

 have been indicated by full lines; the tigure contains also the figure 

 derived in § 6c denoted by curves. 



d. Plate IV fig. 4 and 5 may serve for a comparison of Kuenen's 

 l> 7 -figure (fig. 4) with that derived by construction (fig. 5). In 

 accordance with the remark on T' in § 2, we have proceeded for 

 26° as follows : 



For 5° and 20 J the values of p and T have simply been taken 

 from the construction witli the model, mentioned under a and b. 

 Then we marked a) the p's and 7"s, obtained by multiplying Kuenen's 

 />!■ and Th by p^ and f* (see § 2) ; $ for the different values of x the 

 values of T' and of for the temperature of 26° have been calculated, 

 and then A t and A p determined by the aid of this 6 according to 

 § 2 ; the values of p and T corrected in this way have been denoted 

 by -f -f + and joined by curves with the points men- 

 tioned under a). The full and the dotted curves give the corrected 

 values. Between the parts where we started from the critical 

 temperature, and the ^>T-lines derived fromthe models of 5° and 

 20° a space has been left open. 



