of much value for this purpose, the whole study merely serving to 

 furnish analytical data for the purpose of comparing commercial 

 grades. 



SAMPLING. 



Samples of two varieties of fresh peas were taken by the writer at 

 two factories near at hand. A sample of each size, after passing 

 through the grader, was secured and the analysis begun the same day. 

 Corresponding samples of the peas after being processed were also 

 obtained so as to make as complete a comparison as possible. In 

 addition to these samples, taken under direct supervision, the writer 

 obtained quite a number from other factories, some of which were 

 stated to have been soaked. A few samples were submitted without 

 any statement of quality, the analysis of which seemed to indicate 

 soaking. This point will be discussed in connection with the data. 



The canned peas were first drained in a colander for two minutes, 

 stirring thoroughly so as to remove as much as possible of the ad- 

 hering liquid. After determining the specific gravity, the peas were 

 ground and further determinations made. 



METHODS OF EXAMINATION. 



Specific gravity. Drop 20 sound peas, taken at random, into salt 

 solutions of various strengths and record the number floating and 

 sinking. By the use of solutions ranging in specific gravity from 

 1.Q5 to 1.15 the specific gravity of the sample may be approximated. 



Moisture. Dry a weighed portion of the ground .sample for 

 twelve hours at the temperature of boiling water. 



Ash. Ash the residue from the moisture determination at low 

 redness. 



Crude starch. Transfer 15 grams of the sample to a 500 cc Erlen- 

 meyer flask with 200 cc of water; add 20 cc of hydrochloric acid 

 (specific gravity 1.125) and heat the solution to boiling for two 

 and one-half hours with a reflux condenser. After nearly neutral- 

 izing the acid with sodium hydroxid, transfer the solution to a 300 

 cc flask, add 5 cc of basic lead acetate, and complete the volume to 

 the mark. Filter and remove the lead from a portion of the filtrate 

 with a dry mixture of potassium sulphate and potassium carbonate. 

 In the filtrate obtained from this treatment determine reducing 

 sugar, using Munson and Walker's tables, and multiplying dextrose 

 by 0.9 to obtain starch. 



Nitrogen. Determine nitrogen in 10 grams of sample by the 

 Gunning method. 



Ether extract. Extract the residue from the water determination 

 for sixteen hours with ether. 



aU. S. t>ept. Agr., Bureau of Chemistry Bui. 107, Revised, p. 243. 

 [Cir. 54] 



