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The states of oxygen consumption in the developing eggs thus treated are as is shown in the accompanying figure. The oxygen con sumption is by far the largest in the first and second treatments, as well as much larger in the third and fourth than in the fifth treat ment ; consequently it is clear that the respiratory metabolism goes on markedly in the eggs treated with HCL In the first two treatments the embryonic development and oxygen consumption proceed almost parallel. The decrease of the oxygen consumption on the day after soaking in HCl is followed by a slight increase on the third day when the embryo attains the longest stage. In spite of a slight depression on the follow ing day when the embryo shortens, the oxygen consumption is steadily raised, extending from the stage of embryonic migration to hatching. Accordingly it is self-evidentthat the state of oxygen consumption is markedly different before and after the migration of the embryo. In the third treatment the oxygen consumption proceeds a great deal less than in the foregoing cases, resulting in the delay of two days in the course of incubation. Notwithstanding a slight decrease from the first day of incubation to the third day, one day before the embryo attains they longest stage, it is gradually increased up to the seventh day when the embryo makes its mid-gut discernible. From this stage onwards the oxygen consumption is steadily raised up to hatching. Thissimilarity holds good in the case of the fourth treatment, though

Notes on the Oxygen Consumption of the Developing Silkworm Eggs Treated with Various Methods of Artificial Hatching