eg 
(B46 _ Experiments on tivdn: a8 
vot ae Pies : 
colour and hair vortices are peculiar to itfelf. The ftripe 
on the back, however, is like that of the female onager, and 
of many horfes, without any crofs ftripes.. The tail| ex- 
eepted, it has, in general, the greateft likenefs to the mule. 
But, from the above circumftances, it clearly appears that 
the dfhiggctai is an animal of a diftinét genus, and as 
much peculiar to Afia as the zebra and quagga are to 
Africa ; whereas the afs, and perhaps the horfe, in a wild 
fiate, belong to both thefe quarters of the world im 
common. 
LV. Experiments on, and the Manner of diftinguifbings feveral 
Difeafes by the Urine. . By Mr, CnuicKsHANK,. From 
Cafes of the Diabetes, &c. Second Edition. 
Ta E urme is a fluid feparated from the blood by the 
kidneys, containing feveral neutral falts, with more or lefs 
animal extra¢tive matter. The relative proportions of thefe 
fubftances are found to vary fo much in the fame perfon, 
both in health and difeafe, that it is extremely difficult to 
fix on what may be confidered as a ftandard for healthy 
urine. The {pecific gravity of this fluid reaches from 1005 
to 1033, that of diftilled water being 1000: by expofure to 
the air it foan runs into the putrefactive flate, accompanied.» 
with the production of much ammonia, although when 
figft voided it always contains an excefs of phofphoric acid, 
and reddens litmus: in confequence of this cxeefs, it holds 
in folution more or lefs phofphat of lime, which may be 
readily thrown down by a fixed alkali, or even pure ammo- 
»nia. By evaporation, 36 oz. yield a refidwim | varying 
from I 02. to 1}: this confifts of the muriats of potath and 
foda, the phofphats of foda, lime, and ammonia, the phof- 
phoric and lithic acids, with animal extraGtive matter, 
Their relative proportions in a healthy flate may be nearly 
"as follows : 
Oz. 
| 
| 
| 
a ee. 
ae a 2 ikea Bee 
