124 



Grm>. Ca,O per 100 CO. 

 Temperature. Lamy. Aaber Gunthrie Holm 



.1381 .1318 



10 .1342 .1298 .1342 



15 .1299 .1248 .1320 .1386 



20 .1264 .1293 .1366 



25 .1203 .1254 .1347 



30 .1162. .1160 .1219 



80 .0734 .0740 



100 .0576 .0609 .0597 



The lack of uniformity in these results are due: 

 1st. To difficult solubility of CaO. 

 2d. To supersaturation or incomplete sedimentation. 

 3d. To difficulty of filtering and titrating without loss of 

 alkali, due to absorption of carbon dioxide. 



4th. To difficulty of holding temperature constant when 

 other than normal. 



5th. To impurities in lime. 



Lamy obtained different results on lime of different origin, 

 although all samples were presumed to be pure, i. e. : were 

 prepared from so-called pure chemicals. 



In repeating some of this work I obtain the following re- 

 sults, employing pure lime : 



Temperature. CaO in 100 C. 0. 



100 .0602"! 



80 .0704 i 



80 .0698 }- One determination as high as 



79 .0704 | .0625 



80 .0*598 J 



(These results were all on filtered samples and while 

 uniform are probably somewhat low). 



Seventeen determination at temperatures ranging from 

 20.5 to 25, some on unfiltered and some on filtered samples 

 gave results from .1123 to .1220. The latter figure obtained 

 on some rapidly filtered samples at the highest temperature is 

 probably nearly correct. The method of preparation was to 

 cool water and lime in refrigerator. Shake well and let stand 

 twelve hours or more to room temperature. 



Two samples of commercial lime were secured from deal- 

 ers, washed and made up at low temperature and brought to 

 room temperature as before. The results were at first low, 



