46 
Hence we see again that the effect of evaporation is to lessen the 
oxidizing power of blood and the effect of incineration is to destroy 
it or at least to lessen it very greatly. 
Further, in order to determine to what extent the salts of the 
heav\' metals might be confused with blood, the conduct of a number 
of these substances toward an alkaline solution of phenolphthalin, 
with and without hydrogen peroxide, has been studied. Solutions 
of the several salts named in the following tables were prepared by 
dissolving 10 milligrams of each of these salts in 100 c. c. of distilled 
water. These were then compared as to oxygen-carrying power 
toward reagents (2) and (4) with a solution of human blood con- 
taining 10 milligrams of blood in 100 c. c. Tubes were prepared 
containing 2 c. c. of the reagent and 1 c. c. of water, blood, or the 
solution of the salt. 
The results obtained with reagent (2), alkaline phenolphthahn, 
are given in Table II: 
Table II. 
Xum- 
ber of 
tube. 
Substance. 
Color. 
Immediate. 
After 1 hour. 
After 24 hours. 
1 
Water 
Colorless 
Colorless. . : 
Trace of pink. 
2 
Blood 
Colorless | 
Deep pink 
Deep purplish red. 
3 
Cbromic alum ■ 
Colorless 
Colorless 
Colorless. 
4 ^ 
Potassium cbromate : 
Yellow 
F amt yellowish. . . 
Faint pink. 
5 
Potassium dicbromate 
Light yellow... .. . 
Faint yellow 
Faint yellow. 
6 
Perrous suKate 
Faint yellow 
F aint yellow 
Yellowish. 
7 
Ferrous ammonium sulfate 1 
Faint yellow 
Faint yellow. 
Yellowish. 
8 
Ferric alum 
Faint yellow 
Faint yellow 
Faint yellowish. 
9 
Potassimn f errocyanide 
Light pink 
Faint pmk 
Light pmk. 
10 
Potassium ferricyanide 
Deep purplish red. 
Deep purplish red. 
Deep purplish red. 
Sodium nitroprusside ■ 
F amt trace of pink . 
1 F aint yellowish . . . 
, Reddish purple. 
12' 
Nickel nitrate.. 
Colorless 
; Colorless 
Faint pink. 
13 
j Cobalt cbloride 
Colorless 
Colorless 
Trace of pink. 
14 
i Cupric chloride 
Faint pink 
Trace of pink 
Light pmk; brown 
precipitate. 
15 
: Cupric sulfate 
! Trace of pink 
' Trace of pink 
Faint pink; brown 
precipitate. 
16 
1 Cupric sulfate, M/1000 
Trace of pink 
Trace of pink 
Light pink; brown 
precipitate. 
17 
: Manganous sulfate 
i YeUow 
Yellowish 
; Trace of pink; brown 
precipitate. 
IS 
Manganous chloride 
Yellowish 
Yellowish 
Trace of pink; brown 
i precipitate. 
19 
Silyer nitrate 
1 
1 Faint pink 
Reddish 
^ Reddish brown. 
20 
Mercuric chloride 
Colorless 
Colorless 
Faint pmk. 
Faint pmk. 
F amt pink. 
21 
Lead chloride 
Colorless 
Colorless 
22 
Lead acetate 
' Colorless 
j Colorless 
23 
; Potassium chlorplattnate 
I Colorless 
Faint pink 
Decided pink. 
24 
Sodium chloride 
Colorless 
Colorless 
Trace of pmk. 
25 
! Potassium nitrate 
Colorless 
Colorless 
Trace of pink. 
