METABOLISM OF THE SALMON. 377 



of the fish's stay in fresh water. A comparatively small 

 fraction of the muscular store is transferred to the growing 

 genitalia. The substances thus transferred are proteid, fat, 

 phosphorus-containing materials, and pigment ; the phos- 

 phorus containing materials undergo certain chemical changes 

 in the transference, but serve chiefly in the synthesis of 

 nuclein ; it appears probable that the proteid and fat would 

 undergo analogous intramolecular rearrangements also. 

 Of the substances under investigation only one, the iron, is 

 not derived from the muscle ; this comes from the haemo- 

 globin of the blood. 



W. D. Halliburton. 



