254 
DR. BENCE JONES ON THE VARIATIONS 
(6.) A child two years old, fed on bread with some meat and milk, gave in the 
water passed during the night, acid, specific gravity =1014'6, sulphate of baryta 4‘66 
grs. per 1000 grs. of urine, 
(7.) On the same food another night, specific gravity =1013‘5, sulphate of baryta 
3‘88 grs. per 1000 grs. of urine. 
II. I next endeavoured to ascertain by what causes the variations were produced. 
And first (a.) with regard to food of different kinds. For three consecutive days bread 
alone, with a little rice and water and tea, was taken at the same hours as food had 
been taken in the previous experiments. 
Spec. gr. Sulphate of baryta. 
(8.) Water passed at 6 p.m. clear 1019'46 5’31 grs. per 1000 grs. of urine. 
Water passed at 1 1 filtered 1025’30 10’57 
(9.) Breakfast and dinner as on the previous day. Distilled water only was taken. 
Water passed at 3 p.m. filtered 1025*88 8*03 grs. per 1000 grs. of urine. 
Water passed at 6 . . 1026*00 7'31 
Water passed at 1 1 . . 1030*40 13*21 
(10.) Breakfast and dinner as on the previous day. Spring water drunk. 
Water passed at 3 p.m. . . 1027*56 9*53 grs. per 1000 grs. of urine. 
Water passed at 6 . . 1028*58 9*46 per 1000 urine. 
Water passed at 1 1 . . . 1031*86 13*68 
(11.) Animal food only was taken for three days with tea and water. Breakfast 
at 9 A.M. : animal food and tea. Dinner at 6 p.m. : animal food and water, 1 p.m. 
water was thrown away. 
Water passed at 6 p.m. clear 1023*02 6*86 grs. per 1000 grs. of urine. 
Water passed at 1 1 . . . 1021*10 7’69 
(12.) Breakfast and dinner as on the previous day. Distilled water only taken. 
Water passed at 3 p.m. . . 1021*30 6*30 grs. per 1000 grs. of urine. 
Water passed at 6 ... 1025*52 9*12 
Water passed at 1 1 . . . 1023*60 10*19 
(13.) Breakfast and dinner as on the previous day. Common water taken. 
Water passed at 3 p.m. filtered 1023*92 8*36 grs. per 1000 grs. of urine. 
Water passed at 6 clear 1025*44 9*30 
Water passed at 1 1 filtered 1026*24 11*14 
From the comparison of these numbers with the average previously given, no de- 
duction can be drawn as to the peculiar influence of animal or vegetable food on the 
amount of the sulphates in the urine. After either animal or vegetable food the sul- 
phates are increased. 
II. (b.) I then tried to determine the effect of exercise. 
(14.) Nothing whatever was taken from dinner the preceding day, which consisted 
of meat only, until dinner this day, which consisted of bread, tea, and an egg. The 
