1. By the infection of S-9 bacteria with T-c200 prophage various responses, lethal productive reversible and lysogenic are observed. Some of doubly lysogenized S-9 (T-c200) bacteria liberate phage with a new-type of host range.
2. By infection with both S-9 and T-c200 phage, non-lysogenic S-IX bacteria can be changed into doubly lysogenic S-IX (S-9, T-c200) forms. In the doubly lysogenic bacterial strain thus formed, the new-type of phage is also produced.
3. When the doubly lysogenic bacteria are isolated it seems that they give rise to cells which produce only one or the other parent type phage. It is concluded that recombination occurs only at the time the doubly lysogenic state is initiated.

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The chemical properties of the pigments occuring in the surface layers of the brown rice and the red rice were studied. From the results of the qualitative analyses on warm water extract of the pigmental parts, pericarps and seed coats (including aleuron layers), the authors have arrived at the conclusion that the pigments are series of catechin, catechol tannin and phlobaphene.
Then, catechin+catechol tannin contents of those parts were estimated. A greater amount of the catechin+catechol tannin was estimated from the red rice and the smaller from the brown rice. Consequently, the brown rice gene, Rc, is regarded to have an effect of accumulating the pigments in the pigment layers, and Rd, which is a gene of the red rice when Rc is present, is regarded as causing a greater accumulation of the pigments than in case of the brown rice.

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1. Cytogenetical researches were carried on the F₁ plants raised between T. orientale× S. africanum (ToriSaF₁) and T. Spelta×S. montanum (TSpeSmF₁). 2. The percentage of the matured F₁ plants to the number of pollinated flowers in these hybrids were 0.87 and 1.38 percent respectively. 3. The external characteristics of ToriSaF₁ plants resembled somewhat to the pollen plant, while TSpeSmF₁ to the mother plant than being the intermediate of both parents (photos. 1-2, Table 2) in both cases. 4. ToriSaF₁ plant showed fertility, while TSpeSmF₁ was completely sterile (Table 2). 5. In the 2 F₁ hybrids, the number of bivalents at heterotypic metaphase of PMC's is given in Table 3 and 5. 6. The number of bivalents, for ToriSaF₁ up to 3 and for TSpeSmF₁ up to 7, may be chiefly due to the autosyndesis of chromosomes of AB (ToriSaF₁) or ABD (TSpeSmF₁) genomes. In these bivalents of TSpeSmF₁, however, bivalents produced by conjugation of the chromosomes of S. montanum may have been involved. 7. In these F₁, the formation of equatorial plate in heterotypic metaphase of PMC's was observed in some individuals, in addition to the normal F₁-type division commonly observed in the wheat-rye F₁ hybrids. The frequency of the formation of equatorial plate is given in Table 4 and 6.

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To breed the leaf-rust resistant varieties of wheat by hybridization, interspecific or intergeneric, Agropyron glaucum Roem, et Schult. was adopted as the source of resistance. But, at the same time, such aim was included in this experiment as to make the perennial wheat for the fodder of domestic animals.
Crossing was made between common wheat (including amphidiploid, AAGGDD) and Agropyron glaucum by using the latter species as the pollen parent. Consequently, it was found out that:
1) The cross-abilities are markedly different in different combinations.
2) The chromosome configurations and their frequencies in MI in meiosis are also so (see Table 2).
3) Judging from the number of bivalents observed, it was ascertained that at least one genome is common between these parental species.
4) F₁ plants showed complete self-sterility, but were slightly fertile by backcrossing with the pollens of vulgare parents.
5) Morphologically F₁'s manifested strongly the characters of the pollen parent, Agropyron glaucum through their whole life, resulting in the perennial grasses. They are resistant to diseases, droughtness and are winter-hardy. Especially, tillering-ability is so superior that they will be valuable as the materials for breeding the fodder plants in future.

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