28 



avenue SW., Wasliiugton, T>. C. These apples were cored, pared, bleached, and sliced 

 in the laboratory and were dried on trays made of pure aluminium wire. 



Xo. 14418a. Two hundred grams of the fresh apples represented hy No. 14418, 

 evaporated and afterwards, to the evaporated fruit, 9.7 milligrams of zinc oxid in- 

 solution of dilute nitric acid added. 



No. 14418&. A duplicate sample of 14418 treated as above. 



No. 14418c. A sample of 200 grams of the fresh apples represented by 14418, evapo- 

 rated and treated with 19.4 milligrams of zinc oxid in solution. 



No. 14418fZ. Two hundred grams of fresh apples evaporated without addition of 

 zinc. 



Nos. 14418 a, h, c, and d were all evaporated on platinum. 



Table slioxving per cents of moisture, ash, and zinc oxid in evaporated apples. 



Serial 

 number. 



Moisture. 



Ash. 



Ash in 

 dry sub- 

 stance. 



Zinc 

 oxid. 



Zinc oxid in 

 water-tree 

 substance. 



14075 



Fer cent. 

 15.41 



Fer cent. 

 1.077 



Per cent. 

 1.27 



Fer cent. 

 0. 0060 



Fer cent. 

 .0071 



14076 



15.14 



.919 



1.07 



. 0170 



.0200 



14077 



15.41 



1.075 



1.27 



.0078 



.0092 



14078 



30.02 



.578 



.83 



.0082 



.0117 



14079 



18.40 



.788 



.97 



.0021 



.0026 



14081 



2L22 



1 583 



2.01 



.0100 



.0127 



14082 



31. 23 



.826 



1. 20 



None. 



None. 



14123 



18. 26 



1.201 



1.47 



IS" one. 



None. 



14124 



18.98 



.971 



1.20 



. 0100 



.0123 



14150 



16.00 



. 522 



.62 



.0013 



.0016 



14315a 



18.55 



.782 



.96 



.0072 



.0088 



143156 



18.43 



.982 



1.21 



.0112 



.0137 



14405 



22.25 



.826 



1.06 



.0090 



.0124 



14409 



32.59 



.851 



1.26 



.0216 



.0320 



14410 



32.87 



.809 



1.21 



.0148 



.0220 



14411 



32.52 



.913 



1.35 



.0066 



.0098 



14412 



32.47 



1.031 



1.53 



.0148 



.0219 



14413 



33.06 



.800 



1.19 



.0214 



.0320 



14414 



30.58 



.793 



1.14 



.0242 



.0348 



14415 



27.08 



.950 



1.30 



.0056 



.0077 



14416 



23.11 



1.022 



1.33 



Trace. 



Trace. 



14417 



21.26 



1.188 



1.51 



Trace. 



Trace. 



14418 

 Means .. 









None. 



None. 



--- 





23.85 



.931 



1.22 



.0111* 



. 0152* 



Maxima - 



33.06 



1.583 



2.01 



. 0242* 



. 0348* 



Minima - 



15.14 



.522 



.62 



. 0013* 



. 0016* 



* Exclusive of numbers 14082, 14123, 14416, 14417, and 14418. 



In order to determine the number of milligrams of zinc oxid in 100 grams of the 

 evaporated fruit, move the decimal points in the zinc oxid column in the above 

 table three places to the right. 



DISCUSSION OF DATA OBTAINED. 



No. 14075. In this sample is found a fair illustration of wliat may be 

 expected in a promiscuous lot of evaporated fruits purchased in a 

 locality where drying on galvanized iron wire trays is commonly prac- 

 ticed. Tlie amount of zinc oxid found in this samx)le, it is true, is 

 extremely small, and exx)ressed as per cent becomes almost a vanishing 



