184 ' THE URINE. 



FIBRINURIA. 



Through haemorrhage or exudation of serous fluids 

 into the urinary passages the urine sometimes becomes 

 mixed with fibrinogen, and this may form clots or semi- 

 gelatinous masses. It may cover the bottom of the vessel 

 or occasionally cause the whole mass to gelatinize. The 

 fibrin can be filtered from the liquid through muslin and, 

 after washing, can be tested (Experiments 77 and 80) . It is 

 very similar to the deposit of pus from fermenting urine. 

 The pus, however, can be thinned with water. The fibrin 

 is insoluble. 



GLYCOSURIA. 



Glucose is not normally found in large amounts in 

 the urine, although traces are frequently and perhaps 

 always present. More than a slight trace may be re- 

 garded as pathological if it continues for any length of 

 time. A transitory form of glycosuria (alimentary gly- 

 cosuria) is often caused by excessive quantities of carbo- 

 hydrates, especially of sugar in the food. It may be pro- 

 duced by puncture of the fourth ventricle of the brain, 

 by injuries of the pancreas, by a number of medicinal sub- 

 stances which act upon the vasomotor nerves of the liver, 

 such as phloridzin, etc. 



The urine is generally, though not always, of a high 

 specific gravity (1.030 to 1.050), having a light color and 

 a whey-like odor. The daily volume may be increased to 

 ten times the normal, the solids being likewise increased. 

 When poured or shaken it retains the foam for a consid- 

 erable time. 



