14 BULLETIN 1213, U. S, DEPARTMENT OF AGRICULTURE. 
starch. This material when crushed and treated with water and 
stained with a diluted solution of iodin in potassium iodid gives the 
siene brown or violet color said to be characteristic of erythro- 
extrin. 
The waxy maize used in the digestibility experiments was ground 
at the Bureau of Chemistry; the kernels were more dry than is usual 
in milling corn, and as a result only 3.2 per cent of the total grain 
was removed as bran. Chemical analysis shows the general food 
value of waxy maize meal to be similar to that of the white corn meal. 
TABLE 9.—Chemical composition of waxy maize meal and white corn meal. 
. ; Carbohy- 
Moisture. Protein. | Fat. auclee Ash. 
Per cent. | Per cent. | Per cent. 
6.17 71552 1. 80 
4.24 75. 04 1.30 
Per cent. | Per cent. 
Way Are NIST ete cee coe Cree iy og eee here 9. 88 10. 63 
White corm meal: 5.2 te oe at tee eee be 10. 54 | 8. 88 
The carbohydrate of the waxy maize meal included 1.83 per cent 
crude fiber, and that of white corn meal 1.67 per cent. As indicated 
by these analyses, there is no great difference in the amounts of 
protein, fat, carbohydrate, and ash furnished by these two types of 
maize. 
The ground raw waxy maize was made into frozen pudding and 
served in the usual way. The diet furnished the following average 
amounts of nutrients and energy per woman per day: Protein, 39 
rams; fat, 78 grams; carbohydrate, 279 grams; energy, 1,970 calories. 
he average amount of raw waxy maize eaten per woman per day 
was 184 grams, and the average amount of carbohydrate from the 
maize alone was 132 grams. 
The average coefficient of digestibility for the carbohydrate of 
the maize alone was 97.3 per cent. If allowance is made for 47 per 
cent undigested crude fiber, the average coefficient becomes 98.5 
per cent. The coefficients of digestibility of the protein and fat of 
the entire diet were respectively 86.9 and 96.7 per cent. Micro- 
; 
7 
scopic analysis of the feces gave no evidence of undigested starch or | 
dextrinlike substance. The digestibility of waxy maize meal as 
shown by these experiments is very slightly lower than that of white 
corn meal, but the difference is too small to seem of practical aaa 
cance. The subjects enjoyed the flavor and texture of the pudding 
made with waxy maize meal. 
TABLE 10.—Dvgestion experiments with raw waxy maize meal in a simple mixed diet. 
Constituents of foods. 
Weight 
Experiment, subject, and diet. of food. 
hydrate. 
Water. | Protein. Fat. Carbo- 
408.4 grams or 60.11 per cent oftotal | Grams. | Grams. | Grams. Grane 
Grams. 
Car hdnvaratey sss sats we eee. oe 2,600.0} 1,543.9 114. 1 6 
i .0 
ewww www ewww ew ewww www ewww eee se] bbe U [www wwe we w elem n wenn eelonwsewnneee | Bhhe U lowe weeccce 
-_—_—— ———_— | | —__  _____ ] __ | | LLL 
Total food consumed. .....23.-c000¢ 3,518.0] 2,244.3 120. 5 240. 5 884. 9 
MOCES./ tf. 22h) Me REE Fie se ced HAVO ees 2 eee 14.2 8. 8 26. 4 
AMOUNT WHA is eis Showed oaks carck Glaeex een cd ee ies 106. 3 231. 7 858. 5 
: Per cent.| Per cent. | Per cent. 
Digestibility of entire ration. i. 22.3.3 2b. thi fliftile. 2 88. 2 96. 3 97.0 
Estimated digestibility of carbohy- 
Grates of raw waxy maizemeal alone:|_. <-2.c- ee. ees <select ueeecc|etcacencss 07. 7 'ISoeeeaeeee 
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