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y CHEMICAL DIVISION. { C _ i
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Q M. A. SCOVELL,,DZ7`6CZfO7‘.' ·   *
”   DEAR SIR: The work of the Chemical Laboratory in 1894 was >•- (  _
id l ‘ about the same in character asslast year. The analyses of /1 i ‘
ig E commercial fertilizers made during the year have already been i   §_
 V published in Bulletins 51 and 52. ` ii'° 'Qi 3
HS , Considerable work was done to determine how much arsenic 5
  and copper remain on the cured tobacco where spraying with ` · jg
E Paris green is resorted to for protection against the tobacco ` iq.;
Q  worm. The results have been published in part in Bulletin 53 ·` 1 _  
Q by Prof. Carman, as were also those of a test for arsenic and _ _    
,_  copper in sprayed apples, and seem to show that when the I  
Q poison is properly diluted very little remains upon the leaf. `  
  The most important new line of investigation taken up this .  agi
`  year was the study of the solubility in dilute organic acids, of I  
Q; . the phosphoric acid and potash of the soil, with a view of de-  
Q  vising a chemical method for determining the availability of 3  
  those plant foods that would give results comparable to those -  
  of iield and pot experiments. A very considerable amount of  
  W0rl; was devoted `to this subject, and the preliminary results I  
  are interesting, but it is thought best to defer their publication `  
}  Until the investigation has reached a more advanced stage. ‘  
 , Other methods of analysis received attention in co-operation  
  with the Reporters of the Association of Cfiicial Agricultural  
 _ Chemists, analyses having been made for the Reporters on . V  
  phosphoric acid, rntrogen, sugar and soils and ash.  i d
 A The daily tests of fat in the milk of the Station herd were  A  '
  kept up under the immediate supervision of Mr. VV. H.  
Q  Scherdius. _ , .  
  Quite a number of minerals and miscellaneous materials were  
  €X¤mined from time to time, but the results of most of these  
_ 4  UB Hot of sufficient interest for publication. Such analyses as  
  SBBH1 to be of any permanent or general interest are given in the glji
  following pages : V.