The eggs (52 days old) lose of water and solids until they hatch out, but there are increasion of inorganic matters and alcohol soluble phosphorus (lecithine like substance) and decreasion of proteins and lipins. Some amounts of these decreased substances come probably from the constituents of the egg's membrance and the substances of its perivitellin space both of which won out from the larva, but the absorption of the mineral matters and the formation of some phospholipins are admitted as noticable phenomena. In the next time, there is a considarable metabolic change through larval stage. A youg salmon just absorbed its york-sac gains 85mg. in weight as the result on absorbing 117mg. of water and consuming 35mg. of solids. At any rate, the growth phenomenon through egg and larval stages are consumption of the greater part of the organic matters in them and the assimilation of some mineral matters and large amount of water from the surrounding medium, because several newly constituents as phospholipins or proteins of muscles and etc., are synthesized from the materials contain originally in this organism.