450 Journal of Agricultural Research voi. xviii, no. s 



SUMMARY 



(i) Sudan grass was found to contain about one-third as much hydro- 

 cyanic acid as is found in the grain sorghums. The quantity is greatest 

 in the young plant and decreases rapidly as the plant matures, 



(2) It was found that the colloidal sulphur formed by the Francis- 

 Connell method could be removed by evaporating the solution to dryness 

 and heating the residue to 130° C. for five minutes. 



(3) When 5 cc. of a 10 per cent solution of ferric chlorid were used in 

 100 cc. of solution no observable change in intensity of color was pro- 

 duced by the addition of small amounts of hydrochloric acid and potas- 

 sium chlorid either together or separately. 



