132 



TJRINE OF CHELONIANS. 



300 grains contained — 



Grains. 



Water ......... 289.60 



Urea and alcohol extract ...... 4.58 



Water extract . . . . . . . .1.31 



Uric acid and vesical mucus . . . . . .0.98 



Soluble fixed saline constituents . . . . . .2.55 



Insoluble fixed saline constituents . . . . . .92 



Solid constituents in 300 parts of urine ..... 10.4 



1000 34.66 



When the alcohol extract was treated with concentrated nitric acid, crystals of 

 the nitrate of urea made their appearance in great numbers. Oxalic acid added to 

 the alcoholic extract, gave a precipitate of the oxalate of urea. Aqua ammonia 

 added to the urine, precipitated stellate crystals of the triple phosphate in con- 

 siderable numbers. After standing for an hour or two, uric acid was precipitated 

 from the urine, in the form of an orange-colored sediment, which, under the micro- 

 scope, was composed of lozenge-shaped crystals. 



Urine of a Salt-water Terrapin, which had been kept without food and drink for 

 37 days. Aug. 16. 



Weight of terrapin, June 21st ..... 12,280 grains. 



Aug. IGth ..... 9,255 " 

 lost in fifty-six days ..... 3,025 " 



Loss of weight hourly, grs. 2.25 = -^-^^-gth. of original weight. 



The bladder contained two fluidrachms of clear yellow urine, having a decidedly 

 acid reaction ; also, a considerable quantity of gas. After standing for a short 

 time, a white deposit of the urate of ammonia, and lozenge-shaped and acicular 

 crystals of uric acid settled to the bottom of the vessel. 



When the fluid portion of the urine was allowed slowly to evaporate upon a glass 

 slide, under the microscope, numerous crosslets of the chloride of sodium, and 

 stellate, plumose and irregular crystals of the phosphate of soda and fixed alkaline 

 salts gradually made their appearance. When treated with aqua ammonia, nume- 

 rous delicate, plumose, penniform, and stellate crystals of the triple phosphate were 

 precipitated. When concentrated and treated with nitric acid, crystals of the nitrate 

 of urea made their appearance. The whole amount of urine excreted by the kid- 



neys of this terrapin, in fifty-seven days, 130 grains. 



Solid constituents in 130 grains of urine ..... 8.05 grs. 



130 grains contained — 



Water ......... 121.95 



Organic constituents, uric acid, urea, ammonia, &c. . . . 6.45 



Fixed saline constituents ....... 1.60 



Solid constituents in 1000 parts of urine . • . . . . 61.92 



1000 parts contained — 



Water ......... 938.08 



Organic constituents, uric acid, urea, &c. . . . .49.62 



Fixed saline constituents . . . . . . .12.30 



