580 PROF. LETTS AND MR R. F. BLAKE ON 



(II.) The crude substance was dissolved in boiling dilute baryta solution, the baryta 

 was then precipitated by carbonic anhydride, and the substance obtained from the 

 concentrated solution. 



0-3355 ^ve J 0-8790 C0 2 = 0'2397 C =71-45 per cent. 

 *• I 02072 H 2 = 002302 H= 686 



(III.) The crude substance was recrystallised twice from water. 



02474 e-ave i °' 647 C0 2 =01764 C =7130 per cent. 

 2474 gave { . 1553 H 2 o = . 01725 H== 6 - 97 



(IV.) Another specimen also recrystallised twice from water. 



04412 o-ave J H606 CO, =0-3165 C =71-73 per cent. 

 g (02677 H 2 = 002974 H= 6-74 



The next set of analyses were made by us after the investigation had been re-opened, 

 and we were in possession of a fresh quantity of the substance. 

 Its corrected melting point we now found to be lll o, 0. 

 (V.) The specimen was twice recrystallised, and melted at lll°-0-lll°'l. 



„ QUfi / 08360 C0 2 = 0-2280 C = 7247 per cent. 



0314b gave | . 1923 H 2 = 0021366 H = 679 „ 



(VI.) The specimen was obtained from the mercuric chloride compound (vide infra), 

 by decomposing it with sulphuretted hydrogen. In the combustion, oxide of copper 

 unmixed with chromate of lead was used. 



ftt)/fQ „ f 0-6727 C0 2 = 0-183463 C = 73"67 per cent. 



2490 gave | . 1607 HaO = 0<)17855 H= 7 . 17 ; 



(VII.) The same specimen as was employed for No. V. analysis. The combustion 



was made with pure oxide of copper, and a phosphorus determination subsequently made 



(see p. 556). 



( 07826 C0 2 = 0-213436 C = 7316 per cent. 

 02917 gave J 01912 H 2 =0021244 H= 7-28 

 1 0-1481 Mg 2 P 2 7 = 0041361 P = 1418 



(VIII.) A different specimen recrystallised four times, and of constant melting point 

 1 11°"0. The analysis was performed in the same way as VII. 







(086 

 ^0-21 



62C0 2 



= 0236236 C = 



= 72-75 



per cent. 







0-3247 



gave 



43 H 2 



= 0023811 H = 



= 7-33 



>) 











101623 Mg 2 P 2 7 = 0045327 P = 



= 13-95 



)> 











I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



Carbon, 



. 



68-88 



71-45 



71-30 



71-73 



72-47 



73-67 



7316 



72-75 



Hydrogen, 





668 



686 



697 



6-74 



6-79 



7-17 



7-28 



733 



Phosphorus, 



. 















1418 



1395 



Oxygen (by differe 



ace), 















5 38 



5-97 





10000 



10000 



