(1)M. gluteus maximusThe M. gluteus maximus arises by an aponeurosis from the entire length of the Crista iliaca and muscularly from the dorsal fascia of the posterior surface of the sacrum and coccygeal vertebrae. In those cases in which the origin is the coccygeal vertebrae, it generally arises from the transverse process of the first coccygeal vertebra, but a considerable number was noted in which it arises from the transverse process of the first and second coccygeal vertebrae. No case was observed where the fasciculus arising fiom the coccygeal vertebra is completely separated to form. the so-called M. caudofemoralis.
Except for one case, the fasciculus arising from the coccygeal vertebrae descends separated from the Tuber ischiadicum and inserts into the Tuberositas glutea of the femur, accompanied by the Septum inter musculare laterale. No case was observed in which the insertion into the femur was below the central part of the femur. The fasciculi except those mentioned above are united with the M. tensor fasciae latae and are inserted into the Tractus iliotibialis at the height samewhat lower than the insertion into the femur.
The anterior margin of this muscle covers the posterior margin of the M. tensor fasciae latae, always with union at the lower part, but in the greatest number of cases there is anhesion throughout the whole length of the muscle. Two cases (4%) were observed in which the fasciculus on the outer margin is separated and it is attached to the M. tensor fasciae latae. At the aponeurosis of origin of this muscle, there is always adhesion to the M. gluteus medius, but adhesion with the M. gluteus minimus was not noted.
This muscle is almost always supplied by the N. gluteus inferior and N. gluteus superior which are distributed to the anterior margin of this muscle.

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The development of the junction between the epithelium and lamina propria of the proventriculus of the mouse was studied. The development of this junction is almost completed by 75 days after birth. The lamina propria in the plica mucosae is thin just after birth and then gradually increases its thickness. Also the reticular fibers increase in thickness and the network become dense. The stainability of the reticular fibers increase. The processes of reticular fibers are rod-like by 25 days after birth and then they increase in number and length. Also hooked and bulbus processes can be seen. After 75 days arched processes are observed.
The authors wish to express their heartfelt thanks to Prof. T. Taniguchi for his kind criticism.
This work has been done under the project of Instructor M. Ihnuma.

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The movements of isolated mitochondria were studied under Janus green B supravital staining. The stainability and movements ran parallel with each other. The movements seemed to be active, but decreased with aging of mitochondria. The addition of potassium cyanide,2,4-dinitrophenol, chlortetracycline, chlorpromazine, FMS, riboflavin, FMN, or FAD had no influence on the movements of the freshly prepared mitochondria. The addition of CuSO₄ solution stopped the movements. The action of Janus green B or CuSO₄on the movement of the mitochondria might be attributed to their degenerating action on the surface state of the mitochondrial The author is indebted to Prof. Dr. Ch. Togari and to Ass. Prof. Dr. K. Yagi for their guidance and for their kindness in correcting the manuscript.

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Gross anatomical observation done on the Macacus cyclopsis with regade to the latero-ventral muscles of the abdomen, that is, the M. obliquus abdominis externus, the M. obliquus abdominis internus, the M. rectus abdominis and the vagina m. recti abdominis which is formed by the aponeuroses of these muscles revealed the following results. This study had been done bilaterally on 50 cadavers (32 male,18 female).

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