CHEMICAL COMPOSITION OP POOD-FISHES. 
713 
Ether ext. 0.5000 grin. Pd — 0.4251 grm. Wfr., gave 0.0232 gnu. Ext. 7.81 % Ext. $ ^\ve r J’ f ?i <!' X r,*A n 
0.5000 — 0.4251 0.0332 -7.81% f iii Fr ° 
Ash. 2.0000 grm. Pd. = 1.7004 grm. Wfr., gave 0.1071) grm. Ash. 0.35 % Ash$^^r/V f. 
2.0000 = 1.7004 0.1090 0.41 % l inFr ° 
Recapitulation of analysis of flesh. 
Constituents. 
Protein = N X 6. 25. 
Albuminoids estimated 
by difference. 
In water- 
tree sub- 
stance. 
In fresh 
substance. 
In water- 
free sub- 
stance. 
In fresh 
substance. 
Water 
Per cent. 
Per cent. 
82. 15 
18. 17 
1. 39 
1. 14 
Per cent. 
Per cent. 
82.15 
15. 32 
1.39 
1.14 
Protein 
Ether extract 
Ash 
Total ... 
101. 82 
7.81 
6. 38 
85. 81 
7.81 
6. 38 
116. 01 
102.85 
100. 00 
100. 00 
* The percentage of nitrogen found in the regular analysis was so large that these triplicate de- 
terminations were made later to confirm the results. 
Laboratory Number 261. 
Name : Mackerel, Scomber scombrus. 
Locality: Capes of Virginia, Atlantic Ocean. 
Received : Apr. 29, 1884, from Mr. E. G. Blackford. 
Description : One whole fish. 
Weighings in preparation for analysis. 
Grms. Ounces. Per ct. 
Flesh 279.0 9.8 48.43 
Refuse 290. 0 10. 3 50. 35 
Loss 7.0 0.3 1.22 
Total 576.0 1 lb. 4. 4 100.00 
Analysis of flesh. 
f Partial drying. — 100.00 grms. fresh substance, “ Fr.” = 26.05 grms. partially dried “Td ” 
I =-26.05 % Pd. inFr. * ’ 
Water(dried I Complete drying. — 0.9997 grm. Pd.= 0.9425 grm. Water-free, “Wfr.”z=l 
in < 94.28 % Wfr. in Pd. ! Av’ge 94.28 % 
hydrogen). I Complete drying. — 1.0002 grm. Pd. = 0.9430 grm. Water-free, “Wfr.” = Wfr in Pd 
94.28 % Wfr. in Pd. " I 
( 26.05 % Pd. in Fr. X 94.28 % Wfr. in Pd. = 24.56 % Wfr. in Fr., or 75.44 % Water in Fr. 
Nitrogen. 0.6000 grm. Pd. = 0.5658 grm. Wfr., gave 0.07164 grm. N. = 12.66 % N. $ °° ^ ' x? 
0.6000 = 0.5658 0.07179' =12.67% ) Wlr.ord.il %-N. 
u (in Fr. 
Ether ext. 0.5000 grm. Pd. =0.4714 grm. Wfr., gave 0.0808 grm. Ext. = 17.14 % Ext. S Ext. in 
0.5000 =0.4714 0.0807 =17.12% ) Wfr. or 4.21 % Ext. 
v. in r r. 
Ash. 2.0000 grm. Pd. = 1.8856 grm. Wfr., gave 0.0990 grm. Ash =5.25 % Ash $ A TS e 5 23 , j n 
2.0000 =1.8856 0.0980 • =5.20% ) Wlr.nr 1.28 % Ash. 
u (in Fr. 
Recapitulation of analysis of flesh. 
Protein = 
NX 6.25. 
Albuminoids estimated 
by difference. 
Constituents. 
In water- 
free sub- 
stance. 
In fresh 
substance. 
In water- 
free sub- 
stance. 
In fresh 
substance. 
Water 
Per cent. 
! Per cent. 
75. 44 
Per cent. 
Per cent. 
75. 44 
19. 07 
Protein 
79. 10 
19. 48 
77.64 
Ether extract 
17. 13 
4.21 
17. 13 
4.21 
Ash 
5.23 
1.28 
5. 23 
1. 28 
Total 
101.46 
100.36 
100. 00 
100. 00 
