RKFRACTloN AN1 I>!SN.I;>!<>\ Off TIM- HAl.ncl-VS, IIALOCKN ACIDS. KTC. 

 Suhtnii-tini,' tli.' (/, f 4)"' fn.ni tin- /<"' equation, we obtain four equations similar to 



._!_ LI {,-,}. 



Mj-l /u,-l IN 



I x . t --- be expressed by x, and (nf-nf) by y, and similarly for the other 



M 1 MI 1 

 three equations. Then it can be shown that, applying the method of least squares, 



N = 2 (.r. i/)/2 (x 2 ), and hence n' = *N 2 - + 2 





We have much pleasure in recording our deep obligations to many friends. To 

 Prof. TKOUTON and Prof. A. W. PORTER we owe most grateful thanks for their 

 unwearied patience in assisting, guiding, and encouraging us. To Prof. N. WILSMORE 

 and Dr. WHYTLAW-GRAY we are indebted for instruction and invaluable help in the 

 whole of the chemical side of the work. To the Royal Society we owe our grateful 

 acknowledgment for the assistance of pecuniary grants. 



