62 BULLETIN 846, U. S. DEPARTMENT OF AGRICULTURE. 



these limits the maximum amount of ammonia nitrogen, as indicated 

 by the line, varies from 2.45 to 3.16 milligrams per 100 grams. The 

 dots between 22 and 24 per cent of ether extract indicate yolk, and 

 in these samples the maximum ammonia nitrogen varies from 5 to 

 5.4 milligrams per 100 grams. The encircled dot at the intersec- 

 tion of 26.65 per cent of ether extract and 2.7 milligrams of ammonia 

 nitrogen represents yolk from the freshest eggs obtainable. The 

 corresponding dot for whole egg is at the intersection of 10 per cent 

 of ether extract and 1.5 milligrams of ammonia nitrogen. The dis- 

 tance below the line at which these dots are located is noteworthy. 

 The dots in the neighborhood of IS and 19 per cent of ether extract 

 represent sugared yolk, and the cross at the intersection of 5.7 per 

 cent ether extract and 2.6 milligrams of ammonia nitrogen represents 

 drip. 



As almost all of these results were obtained from August eggs, 

 when eggs are in the poorest condition, there can be no reason to 

 believe that the ammonia nitrogen figures for edible material will be 

 appreciably above the line at any season of the year. The line is 

 applicable for white, whole egg, yolk, or yolky mixtures made from 

 fresh or storage eggs. 



To carry such a plot continually around in order to ascertain 

 whether the result for ammonia nitrogen of any sample would fall 

 above or below the line would be inconvenient. Moreover, some 

 form of expression which can be used in forming a composite picture 

 of all of the different analytical results is very desirable. The proper 

 mathematical expression for the line is evidently what is needed. 

 The expression for such a line is 



Y-Y' ^Z^U x-X*) or B-M' = q,Zqv (Q-Q') 



Widely separated values for B' , Q', B" , and Q" were selected from 

 the plot as follows: 



5' = 0.5 #' = 0.0 £" = 5.0 #" = 22.0 



These values establish the position of the line, whether analytical 

 results or not. Then 



and the vertical distance of any point from this line, in terms of 

 milligrams of ammonia nitrogen per 100 grams of sample, will be 



D = R-0.5 



0.5-5.0 



_0.0-22.0 

 Solving this equation, it becomes 



D=B -0.205 #-0.5 



(#-0.0)] 



