IRON AND COT'l'EK IN OVSTKRS. 
23 
Huitres de Marciines. 
American. 
Gross body weight after drying between filter paper 
3.8 grms. 
6.5 grms. 
Weight, dried at 100° C. for 6 hours 
0.52 
1.02 „ 
Weight of ash 
0.0940 „ 
0. 1 1 40 „ 
Weight of iron found 
0.0003 „ 
0.0:08 „ 
Ratio of Iron found — 
(i) Calcuhited per set of gills 
I to 
2.7 
(2) „ on gross body weight 
I to 
1.56 
(3) „ on weight at 100° C 
I to 
1.36 
(4) „ on ash 
I to 
The relative quantities of iron present in the gilLs as compared with the rest of 
the body were next determined in French, Dutch, and American oysters. Six oysters, 
or the gills of six oysters, were analyzed in each case with the following results : — 
Six Oysters. 
Weight of Iron found, in Mgrme. 
French. 
Dutch. 
Americait. 
Gills 
Bodies minus gills 
0.6 
0.4 
1-5 
2.3 
1-7 
Weight of ash of gills 
„ „ of bodies minus gills ... 
0.1880 
0.5980 
0.02 1 7 
0.1 125 
0.0294 
0. 1 240 
7o iron in ash — gills 
„ „ — bodies minus gills 
0.32 
0.20 
1.85 
1-33 
7.82 
1-37 
Ratio of Iron in gills to Iron in rest of 
body — 
Calculated per oyster 
„ on ash 
1.6 : I 
I : 3-75 
I : 4.1 
I : 0.74 
5-7 : I 
Finally, the total iron in a number of kinds of oysters was determined in order 
to ascertain the normal quantity present. These data, which are tabulated below, show 
a fairly constant proportion of iron per oyster, from 0.15 to 0.36 mgrme., or from 0.18 
to 0.65 per cent, on the ash. 
