Vol. XV, No. 3 (1964-12 issued)
| A Histochemical Study on the Activity of Several Enzymes in Rat Liver Tissues with Special Reference to the Age-factor (With 8 Text-figures) | |
| MATSUZAWA, Tokihiro | 341-346 |
| Cytological Effects of Chemicals on Tumors, XXV. : Further Studies on the Effect of Diphylleia grayi Extracts on Tumor Cells (With 2 Text-figures and 2 Tables) | |
| YAMAMOTO, Kohtaro;KIMURA, Yanagi | 347-352 |
| Chromosome Studies in 14 Cases of Down's Syndrome and in One Suspected Case (With 2 Text-figures and 2 Tables) | |
| MURAMOTO, Jun-ichi;TAKAGI, Nobuo | 360-365 |
| The Karyotype of Hyla arborea japonica with Some Remarks on Heteromorphism of the Sex Chromosome (With 11 Text-figures) | |
| SETO, Takeshi | 366-373 |
| Drosophila Survey of Hokkaido, XX. : Description of a New Species, Drosophila pseudosordidula sp. nov. (Diptera, Drosophilidae) (With 14 Text-figures) | |
| KANEKO, Akasi;TOKUMITSU, Takashi;TAKADA, Haruo | 374-377 |
| Some Mites of the Families Phytoseiidae and Blattisocidae from Japan (Acarina: Mesostigmata) (With 49 Text-figures) | |
| EHARA, Shôzô | 378-394 |
| Rhizogeton ezoense n. sp., a New Hydroid from Hokkaido, Japan (With 1 Text-figure) | |
| YAMADA, Mayumi | 395-397 |
| Generic Characters Viewed from Animal Behaviors | |
| UCHIDA, Tohru | 398-400 |
| Social Relations among Young Yezo Brown Bears in Captivity (With 8 Text-figures and 2 Tables) | |
| MASATOMI, Hiroyuki | 401-417 |
| Forelimb Regeneration in Normal and Hypophysectomized Larvae of the salamander, Hynobius retardatus (With 1 plate) | |
| MATSUSAKA, Tadao | 418-425 |
| Effects of Acidulated Ringer's Solution on the Egg of Dog Salmon, Oncorhynchus keta (With 2 Plates and 4 Tables) | |
| YAMAMOTO, Tadashi S. | 426-438 |
| Reproductive System and Oogenesis in the Freshwater Oligochaete, Tubifex hattai (With 3 Text-figures and 3 Plates) | |
| HIRAO, Yuki-hisa | 439-448 |
| Observations on the Copulation of a Freshwater Planarian, Polycelis sapporo (With 6 Text-figures and 3 Plates) | |
| YANAGITA, Yoshinari | 449-457 |
| Effects of Reduction of Calcium Ions on the Electrical Properties of an Isolated Single Muscle Fibre from the Crayfish (With 6 Text-figures) | |
| MIYAMOTO, Yoshimi | 458-469 |
| Antidromic Impulses Recorded from the Dorsal Root and Peripheral Nerve of the Frog (With 5 Text-figures) | |
| SATO, Toshihide | 470-479 |
| Membrane Permeability and Response to Light in Paramecium (With 5 Text-figures) | |
| OKUMURA, Hiroshi | 480-488 |
| The Change in Birefringence of the Activated Crayfish Single Muscle Fibre (With 8 Text-figures) | |
| KAKIUCHI, Yoshihiro | 489-498 |