22 



of the relative proportions of organic and inorganic matter of the 

 sound and unsound part. 

 Of the sound portion, — 



I. 247 milligrammes gave 10 - 5 milligrammes of ash. 



II. 205-5 85 



Of the unsound portion, — 



I. 311 milligrammes gave 18 milligrammes of ash. 



II. 234 13 



III. 236 13-5 ... 



Or, reducing to 100 parts, the sound portion consists of — 



I. II. 



Organic matter 95*75 95*86 



Inorganic matter . . 4-25 4*14 



100-00 100-00 



whilst the unsound portion gives, — 



I. II. III. 



Organic matter 94-22 94'45 94-29 



Inorganic matter. .. . 5-78 5 - 55 5 - 71 



100-00 10000 100-00 



The mean of the former is 4- 19 per cent, of ash, that of the latter 

 5 - 68, making an excess of 1*49 per cent, arising from loss of organic 

 matter. 



The ultimate analysis of the unsound portion afforded the follow- 

 ing results : — 



I. 155 milligrammes gave carbonic acid 238*5, water 98. 

 II. 132 ... ... ... 202 ... 78. 



III. 163 ... ... ... 251, water not esti- 



mated. 



Mean of two analyses for nitrogen, after the method of MM. 

 Varrentrapp and Will, 1-23 per cent. 



These data furnish the following summary : — 



I. II. III. 



Carbon 42-09 41-73 41-99 



Hydrogen . . 7*02 6"56 7*02 



Nitrogen.... 1*23 1"23 1-23 



Oxygen 43-98 44-80 44*08 



Ash 5-68 5-68 5-68 



100-00 100-00 100*00 



The analysis of the sound potato, by Boussingault, is as fol- 

 1 ows : — 



Carbon 44'1 



Hydrogen 5'8 



Nitrogen 1*2 



Oxvgen 43 - 9 



Ash 5-0 



1000 



