6 THE JOURNAL OF PHARMACOLOGY. 



or diminished quantity. If it is desirable to read percentage of urea, the 

 decimal point is removed two figures to the right : thus o.oi gm. to the cc, 

 would read i per cent, of urea. The normal quantity of urea in urine is 

 about 0.02 gm. per cc. or 2 per cent. Lowering the ureometer in a vessel 

 of water until the water and hypobromite solution inside and out of the 

 graduated limb are on a level, will give a more correct reading. The in- 

 strument * is graduated for a temperature of 65° F. , and is designed for 

 the rapid approximate estimation of urea. It yields, when the test is pro- 

 perly carried out, results which closely approximate those obtained by 

 other methods. 



r^ 



Fig. 3. 



Fig. 4. 



B. Hind's modification of the Doremus Ureometer (Fig. 3). 



This instrument furnished more exact results than the original. The i 

 cc. of urine required for the test is delivered with great accuracy, no gas 

 escaping by way of the bulb. The writer has found the instrument to 

 give results which were very satisfactory and would recommend its use. 



C. Squibbs' Urea Apparatus (Fig. 4). 



This apparatus is intended for the approximate estimation of urea. A 

 number of reagents may be used with this apparatus, the object in each 

 case being the decomposition of the urea of urine. Briefly, these are the 

 following : 



*The apparatus, properly graduated, may be obtained from Eimer and Amende 

 New York City. 



