68 PROCEEDINGS OF THE AMERICAN ACADEMY 



XII. 



The solution consisted of 71.5 cm. 8 of Solution IV. diluted to 

 500 cm. 3 Every 40 cm. 3 contained, therefore, 0.0270 gr. P 2 6 . 



XIII. 



The solution consisted of 71.5 cm. 8 of Solution IV. diluted to 500 

 cm. 8 Every 40 cm. 3 contained, therefore, 0.0270 gr. P 2 5 . 



XIV. 



The solution consisted of 61.3 cm. 3 of Solution VI. diluted to 

 500 cm. 3 Every 40 cm. 3 contained, therefore, 0.0269 gr. P 2 5 . 



XV. 



The solution consisted of 61.3 cm. 3 of Solution VI. diluted to 

 500 cm. 3 . Every 40 cm. 3 contained, therefore, 0.0260 gr. P 2 5 . 



XVI. 



The solution consisted of 125.6 cm. 8 of Solution VIII. diluted to 

 one litre. Every 40 cm. 8 contained, therefore, 0.0269 gr. P 2 6 . 



Each of the following experiments was made with 40 cm. 8 of one 

 or another of these solutions diluted (if necessary), so that the volume 

 after precipitation should for the weaker solutions be about 100 cm. 3 , 

 and for the stronger solutions from 125 cm. 3 to 150 cm. 3 . 



Precipitation was effected in cold solutions unless the contrary is 

 stated, and, when not otherwise specified, either by a magnesic sul- 

 phate mixture consisting of one part of crystallized magnesic sul- 

 phate, two of amnionic chloride, four of concentrated ammonia, and 

 eight of water ; or by a magnesic chloride mixture containing three 

 parts of crystallized magnesic chloride, eight of amnionic chloride, 

 sixteen of concentrated ammonia, and thirty-two of water. The pre- 

 cipitate of ammonio-magnesic phosphate was, in every case, finally 

 collected on asbestus felt in a perforated platinum crucible according 

 to the process previously described by me,* washed with GO cm. 3 to 

 70 cm. 8 (applied in successive portions) of a solution of one part of 

 concentrated ammonia to three of water, — this amount being found 

 to be more than sufficient for washing, when the asbestus process is 

 used, until the filtrate ceases to show the presence of chlorine 

 when treated with nitric acid and argentic nitrate, — moistened with a 



* These Proceedings, XIII. 312. 



