he urine, the larger will its quantity be; so that the inferior
quality is in this way made up for by its increased quantity.

Keeping in mind, then, the fact we have just stated--viz., that the
composition of urine will vary according to different conditions--we may
obtain an approximate idea of what its composition is from the following
results of analyses by Stoeckhardt. In 1000 parts the following
quantities of _water_, _nitrogen_, _phosphoric acid_, and _alkalies_
were found to be present.

From the following table it will be seen that the urine of swine
(containing 97 per cent of water) is much poorer in nitrogen and
alkalies than is the case with the urine of the sheep, horse, or
cow.[134] While this is the case, the amount of phosphoric acid it
contains is greater than that contained in the sheep's urine.

-------------------+------------+-------------------------+------------
| | | Phosphoric |
| Water. | Nitrogen. | Acid. | Alkalies.
+------+-----+------+-----+------+-----+------+-----
| Per | Per | Per | Per | Per | Per | Per | Per
| 1000 |cent.| 1000 |cent.| 1000 |cent.| 1000 |cent.
|parts.| |parts.| |parts.| |parts.|
-------------------+------+-----+------+-----+------+-----+------+-----
Sheep (2 lb. hay }| 865 | 86.5| 14 | 1.4 | .5 | .050| 20 | 2.0
per diem) }| | | | | | | |
| | | | | | | |
Swine (winter food)| 975 | 97.5| 3 | .3 | 1.25 | .125| 2 | .2
| | | | | | | |
Horses (hay and }| 890 | 89.0| 12 | 1.2 | - | - | 15 | 1.5
oats) }| | | | | | | |
| | | | | | | |
Cows (hay and }| 920 | 92.0| 8 | .8 | - | - | 14 | 1.4
potatoes) }| | | | | | | |
-------------------+------+-----+------+-----+------+-----+------+-----

Phosphoric acid is present in the urine of the farm animals in the most
minute traces: practically, it may be considered to be wanting in the
urine of the horse and the cow, and is present only in small quantities
in sheep's urine. The pig's urine, indeed, contains it in larger
quantities; but the percentage is still