3G3 



1S13.] Azote, of Hydrogen, and of Ammonia. 

 true limit. In my experiments I always found that the liquor 

 which after an ebullition continued for 12 or 16 hours floated 

 over the lead covered with subnitrite at a maximum, deposited 

 anion* the crystals of this subnitrite a notable quantity of sub- 

 nitritl at a minimum, and of course 130 parts of lead are less 

 than the nitrate was actually capable of dissolving. 



It is clear that if nitrous acid were Az + 4 O, and azote 

 were considered as a simple substance, the greatest quantity of 

 lead which could possibly be dissolved by 100 parts ot nitrate of 

 lead would be «7 parts ;"since that quantity being dissolved, the 

 quantity of oxvgeii remaining in the nitrous acid would be equal 

 to that in the 'oxide of lead combined with the acid. It, on the 



has verified some of my numerical results. In a subsequent paper he has 



moie correct, hc nuuiu these uroDoruons never can be 



tl,i,, S relU>0| lo toiral propomoo, for <a>mw ZoteamM, f ot 



give for residue the same quantity of oxide wiucn ine u gIlbnUl1 , e S1IU _ 



gave K iven if it had been l^^'s^ qua, u o Ude C"AS 



contain, none. Hence when .he mixture S ™£**J' / "^ * ' C h e 7- 



none of my experiment, did .Ins P^'PJ^Xt thTsubnitrite at a maximun * 



nilrir arid M Chcvreul obsei vis, likew ^e, inai nit suuim 



• . t ,'v him wm not so much coloured as 1 had described I ; and ,., fact I 

 .inai)-en oy Him «a i,,,,..- ..vnp.iment* at obtaining two kinds of 



have been much lurprised in n.y lattei «P er,me ""~ ° , , ? le vel(ow . 



1 1- »" "l'™"-'S ItoaaaM"* ' /; ,' t ' f ,, , ,00 pans of nitrous 



of crystallization amounting to 1-«S P« cent. » ai noi umi 1 . 



acid are « Ined in ll with ISS1 parts of ox.de of lead, or tour times as 



matt a, in the neatral nitrite. 



1 



