IOWA ACADEMY OP SCIENCE 
149 
A portion of the fruit was heated with an excess of soda-lime in a dry test 
tube. The fumes reacted alkaline to litmus paper. A similar effect was pro- 
duced by heating the berries alone at a high temperature. 
The nitrogen was determined by the Kjeldahl method; 2.0933 grams of the 
berries gave 0.0112 gram of nitrogen, equivalent to 0.53 per cent. 
A quantity of solution which resulted from boiling the berries in distilled 
water was tested to learn if the albumen contains sulphur. We treated a solu- 
tion of lead acetate with caustic soda until the precipitate which first forms 
is redissolved. The fruit solution was now added to this and heated to boiling. 
A dark colored precipitate of lead sulphide formed which indicates the presence 
of sulphur. 
THE ACIDS. 
The acid tests were made from the sugar extraction. Tartaric and citric 
acids were found, with a small quantity of malic acid. Citric acid seemed to 
predominate. 
