188 



PROCEEDINGS OF THE AMERICAN ACADEMY 



after the ignition. In the case of quantities so minute the error 

 which is introduced by such an assumption cannot be considerable, and 

 in relation to this point Dittraar * maintains that comparatively large 

 amounts of acid sodium or potassium sulphate may be reduced to the 

 neutral salt by ignition simply. The figures of the column showing 

 the weights of lithium chloride found are derived by calculation from 

 the weights of lithium sulphate actually found. The other headings 

 of the table are sufficiently intelligible without further explanation. 



Weight of Weight of 

 NaCl taken. NaCl found. 



grm. 



(23) 0.1089 



(24) 0.1084 



(25) 0.1074 



grm. 

 0.1092 



0.1085 

 0.1067 



Weight of NaCl 

 found, corrected 

 for Solubility in 

 Aniyl Alcohol. 



grm. 



0.1095 



0.1090 



0.1074 



Error in 



Weight of 



NaCl 



found. 



grm. 



Error in 



corrected 



AVeight of 



NaCl found. 



grm. 



Volume of Amyl 

 Alcohol used. 



Resid- 

 ual, 

 cm. 3 cm.3 



Total. 



0.0003+ 0.00064- 7 70 

 O.OOOl-j- 0.0006-1- 12 80 

 0.0007— 0.0000 18 90 



Weight of 

 LiCl taken. 



grm. 

 0.1298 



0.1227 



(23) 

 (24) 

 (25) 0.0116 



Weight of 

 LijSO^ found. 



grm. 



0.1682 

 0.1592 



Weight of 

 LiCl found. 



grm. 

 0.1299 



0.1230 



Corrected 

 Weight of 

 LiCl found. 



grm. 



0.1296 

 0.1225 



Error in 



Weight of 



LiCl found. 



grm. 



0.0001-[- 

 0.0003-}- 



Error in cor- 

 rected Weight 

 of LiCl found. 



grm. 



0.0002— 



0.0002— 



* Report on Researches into the Composition of Ocean Water, collected by 

 H. M. S. Challenger during the Years 1873-1876, p. 18. 



