334 Dr. Kolbe on the oxidizing power of Oxygen, S^c. 



Name of Crop, &c. 



i Weight per 

 I acre of crop 

 I in tons. 



Gypsum, 



Bone-phosphate. 



Hay 



Clover hay (one crop) 



Clover, green (whole crop) 



Lucern 



Lints 



Wheat 



Ditto, straw 



Barley 



Ditto, straw 



Oats 



Ditto, straw 



Beans 



Ditto, straw 



Peas 



Ditto, straw 



Rye 



Ditto, straw 



Potatoes 



Ditto, tops 



Carrots 



Ditto, tops 



Mangel-wurzel 



Ditto, tops 



Swede turnips 



Ditto, tops 



Early yellow-top ditto 



Ditto, tops 



Rape 



Cabbage 



34 to 67 



29 



45 



93 to 152 



34 



7 to 10-1 , 



38 to 55 / •*"^ 



36 to re}*'"" 



>»}30 



is}" 

 .?}" 



11}'-' 

 L'}=> 



140 



to 65 



88 



26 to 32 



35 



53 



14 to 103 



31 



44 to 501 



7 to 18/ 



^^•l67 



51 to 68 



12/ 



8to2?}56to73 

 69 1 



241 

 12/ 

 171 

 28/ 



} 



1 88 



} 

 } 



■ 96 

 -36 



-45 



126 



85 



49 



80 



LII. Observations on the oxidizing poiver of Oxygen luhen 



disengaged by means of Voltaic Electricity. By H. Kolbe, 



Esq., Ph.D.* 



TN describing in a former paper f the properties of sesqui- 



chloro-carbohyposulphuric acid, I stated that this l)ody 



resists the action of the most powerful oxidizing agents, such 



as chromic acid, nitric acid, and even nitro-hydrochloric acid. 



I hkewise stated the change it undergoes by the action of 



a voltaic current, when an easily oxidizable metal is used 



for the positive pole. By this means another copulated acid 



is produced, in which one or more equivalents of chlorine are 



replaced by corresponding proportions of hydrogen. 



I have since observed that this acid is completely decom- 

 posed on employing two platina plates as electrodes ; by 

 which arrangement oxygen is disengaged at the positive pole. 

 The following details, which contain a more perfect account 

 of this observation, I hope will be acceptable to the Society. 



• Communicated by the Chemical Society ; having been read Dec. 7. 

 1846. 



f Liebig's Annalen der Chemie, liv. pp. 156, ICO. 



