182 
Proceedings of the Royal Society of Edinburgh. [Sess. 
t. 
H. 
Curve. 
R. and Y. 
Observations. 
1 
J. 
S. and M. 
Static. 
Dynamic. 
280° 
143 
140*5 
147 
132 
138 
290 
195*5 
189 
200 
178 
189 
300 
259*5 
264*5 
251 
275 
237 
252 
310 
350 
333*5 
367 
309 
336 
320 
460*5 
443*5 
500 
401 
447 
330 
599*5 
596 
675 
518 
587 
333*5 
661 
653 
750 
566 
642 
340 
778*1 
777 
759*5 
678 
The curves (fig. 2) show the results graphically : I. is R. and Y.’s curve, 
II. gives Johnson’s results, III. gives our own. Two points ( x ) are 
from Horstmann’s data. 
The University of Chicago, 
April 1910. 
( Issued separately December 29, 1910.) 
