P. Collier on Indirect Determinations of Potash and Soda. 345 
may hold 70 c. c.) graduated to fifths ensures the needful accu- 
tacy of reading. In my determinations #;th c.c. of silver solu- 
tion were deducted as the excess needed to produce a visible 
quantity of chromate of silver. 
The appended table gives the results I obtained in the analy- 
ses of the chlorids of potassium and sodium. The salts were 
ay pure and the quantities were weighed out in each case. 
order to test the method thoroughly I have varied the pro- 
portions of the mixtures from one extreme to the other. 
Summary of Volumetric Chlorine Determinations. 
K Ci taken. |NaCliaken.) Cl found. hi 
_ analysis, 0582 | ---- | 02780 | 05725 
~ Bie 1668 ---- | 07940 | ‘16617 
a. “1507 ---- | O7168 | ‘15056 
ae 3 0590 
a 782 | 0317 07881 
i 0379 | 03750 
as 0169 
Grou 0166 01514 
en 0429 | 05120 | 05319 
ith  « se Bo | 09029 
et 0182 | 05820 
1a 967 0102 | 05217 
gigi ‘0101 1600 po sees 01089 
oe 1100 
og may be seen from the above list of analyses, which includes 
‘the determinations I have made, from first to last, for the 
Purposes of this paper, that in no case does the difference be- 
tween the quantities taken and found of either alkali chlorid 
exceed two milligrams, and in most instances it is less than one 
tailligram, The correspondence between the amounts of chlorine 
AM. Jour. Sct.—grconp Serres, Vou. XXXVII, No. 111—Mar, 1864. 
