. Urinary deposits : their diagnosis, pathology, and therapeutical indications. of the 2 3 4 56 I have not been able to verify these statements, andam inclined to believe that these supposed cycles ofdaily variation bear a direct relation to the periodicityof the meals (71). 51. It is quite impossible to assign any limits withinwhich the specific gravity of the urine secreted at dif-ferent periods of the twenty-four hours may possiblyrange. In addition to the bulk of water eliminatedfrom the circulation by the kidneys in a given timebeing materially affe
. Urinary deposits : their diagnosis, pathology, and therapeutical indications. of the 2 3 4 56 I have not been able to verify these statements, andam inclined to believe that these supposed cycles ofdaily variation bear a direct relation to the periodicityof the meals (71). 51. It is quite impossible to assign any limits withinwhich the specific gravity of the urine secreted at dif-ferent periods of the twenty-four hours may possiblyrange. In addition to the bulk of water eliminatedfrom the circulation by the kidneys in a given timebeing materially affected by the state of surface (45)and other causes, the amount of fluids drunk will exertan important effect in modifying the density and bulkof the urine. In many persons mere mental anxiety, orthe ingestion of a few cups of tea, a glass or two of hock,or a goblet of soda-water, will at once determine the se-cretion of urine of a density as low as or Thefree use of aqueous diluents will also greatly increasethe bulk, and in a corresponding degree diminish the D. i-0 YSIOLOGY OF UEINE. density of the urine. And from some recent observa-m& oijfeoiessor Liebig it appears probable that thepurer the water, the more freely is it absorbed into theblood, and eliminated by the kidneys, the presence ofsmall quantities of saline matter considerably retardingits absorption and subsequent excretion (385). It was observed by Becquerel13 that a man whosenormal average of urine in 24 hours was 30 ounces,passed 56 ounces after swallowing about a quart ofwater in the day. In another case the natural aver-age, or 32 ounces, was raised to 87 ounces after the im-bibition of half a gallon of water in the 24 hours. Severe mental emotion, especially a paroxysm of hys-teria, will also obtermine the secretion of pale aqueousurine, of low density (50). A young woman who na-turally passed in 24 hours about 35 ounces of urine,voided 86 ounces after the occurrence of a hysteric fitin the course
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