230 THE INCOME OF ENERGY 



bacteria causes the formation of bacteriolysines 

 which destroy the injurious organism. 



Many haemolysines and agglutines are found 

 in plants ; others, for example, the tetanus bacil- 

 lus, are bacterial; still others, such as snake 

 venom, are animal secretions. 



OXIDIZING FEKMENTS 



Schdnbein's Experiment. 1 1. To five c. c. hy- 

 drogen peroxide add tincture of guiac (freshly- 

 prepared by dissolving guiac resin in alcohol) 

 drop by drop until the liquid is milky. Now 

 add from eight to ten drops of a somewhat con- 

 centrated extract of malt, prepared in the cold. 



The guiac will be oxidized and will turji blue. 



2. Repeat the experiment, adding in place of 

 the malt extract from eight to ten drops of blood. 



The guiac will be oxidized, as before. 



Further Oxidations by Animal Tissues. 2 

 1. Soak strips of bibulous paper in a diluted solu- 

 tion made as follows : 



a-naphthol 1 mol. 



sodium carbonate . , . . 3 " 

 para-phenylenediamine . . 1 " 



1 Schonbein : Zeitschrift fur Biologie, 1868, iv, p. 367. 



2 Spitzer : Archiv fur die gesammte Physiologie, 1895, Ix, 

 pp. 322-323. 



