Am.  Jour.  Pharm. 
Feb.,  1884. 
Expansion  of  Urine. 
89 
amount.  In  view  of  these  discrepancies,  and  of  the  improbability  that 
the  correction  should  be  so  large  as  stated  by  Neubauer  and  Vogel,  I 
thought  it  worth  the  while  to  make  an  experimental  test  of  the  matter, 
and  I  have  embodied  the  results  of  my  observations  in  the  accompany- 
ing tables.  The  figures  represent  the  apparent  specific  gravities,  as 
taken  with  an  instrument  adjusted  to  a  temperature  of  60°F.,  the  unit 
of  comparison  being  water  at  that  temperature.  For  practical  pur- 
poses the  correction  should  be  deduced  from  apparent  and  not  actual 
specific  gravities ;  otherwise  there  will  be  not  one  but  several  correc- 
tions to  be  applied  to  the  figures  obtained  by  observation. 
Table  I. — Apparent  Specific  Gravity  of  Urine  observed  at  Temperatures 
from  50°  to  95°i^.,  Water  at  60° F.  =  1-0000. 
Temperature. 
Specimen, 
Specimen, 
Specimen, 
Specimen, 
Specimen, 
Specimen 
Fahr. 
No.  1. 
No.  2. 
No.  3. 
No.  4. 
No.  5. 
No.  6. 
1-02315 
1-02495 
1-01305 
1-02075 
1-0223 
L-0226 
1-0230 
1  -0235 
1-0124 
1-0203 
1-02175 
1-0221 
1-0226 
1-02295 
1-0119 
1  -0198 
1  -0212 
1-0215 
1-0221 
1-02235 
1-0114 
L-019J5 
1-0204 
1-0209 
1-0215 
1  -02155 
1-01075 
1-01845 
1-0197 
1-02025 
1-0208 
1-02085 
1-0101 
1-0177 
1-0190 
1-0195 
1-0201 
1-0201 
1-0094 
1-01685 
1-0181 
1-0187 
1-0194 
1-0193 
1-0087 
1-0160 
1-0172 
1-0179 
1-0186 
1-0184 
1  -0080 
1  -01515 
1-0162 
Term 
oerature. 
sahr. 
Specimen, 
No.  7. 
Specimen, 
No.  8. 
Total 
correction 
(average). 
Average 
correction 
for  1°F. 
Solution 
of 
common 
salt. 
Distilled 
water 
(apparent) 
50°  
1  -0267 
1-0285 
—  -00105 
•000105 
1-0630 
1-00050 
1  -0261 
1  -02745 
—•00054 
•000108 
1-0625 
1  -00026 
1-0255 
1-02695 
+  -00000 
1-06192 
l'OOOOO 
65°  
1-0249 
1-02645 
+  •00057 
•000114 
1-0612 
•99956 
70°  , 
1  -0242 
1-0258 
+  •  00122 
•000122 
1-0604 
•99912 
1-0235 
1-0251 
+  •  00190 
•000127 
1-05955 
•99861 
1-0228 
1  -0244 
+  •  00263 
•000131 
1-0586 
•99797 
85°  
1-0221 
1-0236 
+  -00342 
•000137 
1  -05765 
•99732 
90°  
1  -0214 
1-0227 
+  •00424 
•000141 
1-05665 
•99657 
950  
1  -0206 
1-0218 
+  •  00509 
•000145 
•99476 
