ammonia in this connection, believing thai th< 



cretion is, like the acetone bodies them 



metabolism. Be this as it may, il 



for neutralizing acid in disi although it □ 



factor in tlir maintenance of neutrality under I [1 



a factor of Bafety, in thai it helps to care for an inc 



the normal mechanism of the body is o 



Excbetion of Phosphates. The more permam ity 



depends on the excretion of phosphates by the kidi 



erning this process is i sactly I 1 in 



connection with carbonic ac.id. In the one case il 

 C0 2 , and in the other, the fixed phosphoric acid tl 

 reaction. The ratio between the acid Baits of phosph< lid, Mil 1 



and til-' alkaline salts, M III*'', in blood is approxim but in 



the mine this ratio varies according to the amounl of H ioi 

 !><• eliminated from the blood. In other words, a defin 

 phoric acid i^ enabled to carry variable amounts of II ion 

 by causing the amount of alkali excreted in combination with it 

 come altered. For example, in the form of MH,PO amounl 



1'", obviously carries ou1 more II ion than when it 

 M BP0 4 . The adjustment between these 1 the 



kidney. We may a rdingly measure tin' amounl of alkal I by 



the organism by finding how much standardized alkali m 



a given quantity of urine until the reaction obtaii 



since the latter value is constant, the titration can be done simplj 

 titrating the urine with an indicator Buch as gulph< "in. 



which changes tint at aboul Ph of blood. 



A more serviceable indicator t<> use, howe 



cause its end poinl is BUCh that when human mine just r Tail 



to it that is, when the titrable add approacl 



ing power of the plasma iv ,-it its maximum 



ammonia excretion by the urine is eero Vai 9 [1 



therefore, to use this indicator, because it hap 



poinl situated for a reaction which is well 



trality, and which is reached in urine when tl • 



acid-combining power and no ammonia is bein 'ion 



purposi - \> the « 1 1 combining p" 



Bhould, therefore, '"■ a proportionate ii 



titrable acidity of the urii 



Although a genera] parallelism •■• 

 diabetes, i tc . there is no Btri< 

 therefore 1 n tried of comparii ith 



