本研究に於ては1951年夏にプロラクチン注射を行つたプリマスロツク雄4羽の内B32(就巣)とno.38(不就巣)の2羽の♂に不就巣(B90),軽度の就巣(no.47,K370),強度の就巣(K245,K242)性を有する雌を交配して得たF₁の第一年度の就巣性の有無を調査した。結果は次のようであつた。
1.不就巣雄に不就巣雌を交配したF₁は不就巣であつた。
2.不就巣雄に軽度の就巣雌を交配したF₁は不就巣であつた。
3.不就巣雄に強度の就巣雌を交配したF₁は就巣するものとしないものとがあつた。
4.就巣雄に軽度の就巣雌を交配したF₁は何れも就巣性を現はした。
以上は少数の実験の結果ではあるがプロラクチン注射によつて区別された就巣雄と不就巣雄とが就巣に関する因子型を異にして居るであらうという当初の想像が正しそうである事を示して居ると思う。又F₁の示した就巣性の有無はそのものゝ持つ因子型と関係ありそうに考えられるが,数が少いからその点には今回はふれない事とする。しかし兎も角も此の結果はプロラクチン注射を利用して雄の因子型を確かめ,その結果によつて鷄の就巣性を除去しようとする計画が有望である事を示していると思はれる。

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Père David's deer (Elaphurus davidianus) is a member of the deer family but in China, since her olden days, it was considered to be a mysterious animal whose hoofs resemble somewhat to that of cattle, its head to that of horse, its body to that of ass, and its antlers to that of deer but it does not belong to any of these. Since it became extinct in China, there is no way of ascertaining its native habitat. Those first discovered in China were found in the Imperial Park in Peking where the herd was extirpated by 1900. In 1888 a pair from Peking reached the Uéno Zoological Garden, Tokyo and gave birth to two offspring while one, a female, reached its maturity. Unfortunately however, all the four died one after another toward the end of the Meiji Era, thus no living individual could be found in the Orient.
Specimens of Père David's deer preserved in Japan to-day are as follows:-
1) A mounted head of a male with antlers and a skull of another with abnormal antlers are preserved in Dr. Hachisuka's collection.
2) A complete skeleton of a male a and a skull with antlers are preserved in the National Science Museum, Tokyo.
3) A mounted female and an antler are preserved in the museum of the Gakushâin University, Tokyo.
In the present article the author fully explains the details of specimens preserved in Japan to-day, introduction and status in the Japanese zoo, the past history in China and subsequent waning of its tribe, reasons why it was considered mysterious, and other points of interest.

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During the years from 1949 to 1951, the author joined eight trips planned by the Wildlife Branch, Natural Resources Section, GHQ (Tokyo) and the Ornithological Branch, 406 Medical General Laboratory, U. S. Army (Tokyo). Specimen records and brief notes of some not well known species, observed and collected during these trips to Hokkaido, northern Honshu (Pacific side) and southern Kyushu, are given. Many thanks are due to Mr. F. Wilke, Dr. H. E. McClure and Capt. R. B. W. Smith, by whom kindness some of the rare specimens were added to the author's collection. Fairly many sea bird records are given as the result of pelagic collection chiefly made with Mr. Wilke off the coast of northern Honshu and southern Hokkaido. Few more pelagic records from 1952 collection, made by the kindness of Mr. K. W. Kenyon, are added as additional note.

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The diploid number of chromosomes was determined as 80 (_??_2n) in the spermatogonial divisions. The macro-chromosomes include four pairs, being 8 in number. They have a formula consisting of aR+bv+cr+dr. The micro-chromosomes vary in size from small rods to spherulus and are 72 in number.
There are found with indisputable clearness 40 bivalents in the primary spermatocyte metaphase plate. Two larger bivalents, probably descendants from the aR and bv elements of the diploid group, are remarkable for their conspicuous configuration.
The karyotype as found in this species is quite unique in birds so far studied. In the related species, Charadrius dubius studied by Yamashina (1946), the following choromosome formula was given:
Charadrius dubius 2J's+2V's+2R's+4v's+68r's _??_2n=78
In comparison with the chromosomes of Arenalia interpres, there is no approach or similarity between the two species. Cyto-taxonomical consideration will be retained until further data can be accumulated.

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ドバトの抱卵交替に関し主として交替時間を正常の場合や,暗幕処理其の他,点燈処理のものについて記録した。其の結果はノーマルの場合でも雨天の時は♂の抱卵時間が晴天より短縮されるようにみえる。之は暗幕処理で更にはつきりしている。隨つて交替時間に直接影響すると考えられる因子は日照時間と推定された。

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筆者は日本人に於ける数種薬品に対する味覚の個人差殊に味盲の頻度を調べた。その結果,安息香酸ソーダは一般に無味とされているが実際は何かの味を与え,苦味を感ずる人は男子で12.56%,女子では11.82%である。次に殺鼡剤A.N.T.U.では多くの人に苦味を与え,味盲者の頻度は男子で6.75%,女子では6.58%であつて,この値は米国人及豊橋市日本人の味盲頻度より遙かに小さい。又性差及び年令による差も明瞭に認められた。又マンノーズでは多くの人に甘味及び苦味と甘味の混合味を与える。味盲頻度は男子は女子より大で1.7%,女子は0.7%を示した。以上の事より味覚の個人差特に味盲の頻度は人種により又地域により多少の差が認められるのを知る。

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Mr. G. Okuyama in November, 1933 procured a swan on Hachijo Island, one of the Seven Islands of Izu and, it was identified by Mr. Tokutaro Momiyama (1939) as Cygnus cygnus (specimen no. 340033).
I have recently exmined this specimen and found out that it is Cygnus olor, not C. cygnus as formerly considered it to be. This fact constitutes the first record of the Mute Swan found in the Japanese Islands.

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1) Before or during the Meiji Era (1868-1912) no live penguin or its skin was imported into Japan,
2) but sometime towards the end of that era, only about 1911, the first skin was introduced into Japan.
3) In the Taishô Era (1912-1926) many live penguins were introduced, while one brought over to the Ueno Zoological Garden in Tokyo in June 1915 was presumably the first live example in this country.
4) In the Shôwa Era (1926-) penguins became common among zoological gardens and some bred from time to time.
5) By the end of the Pacific War the live stock of penguins became extirpated throughout Japan, but were re-introduced since. Those reached after the war were brought over by some whaling vessels from the Antarctic.
6) Up to the present at least six species of live penguins: Pygoscelis adeliae, P. antarctica, Eudyptes pachyrhynchus, Spheniscus demersus, S. humboldti and S. magellanus,
7) and at least ten species in skin specimens reached Japan.

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