1) With seven strains representative of each of the four groups of lemon-grass strains classified in previous studies, investigations on the relation between the strain and myrcene content of leaf oil which was gained from field and greenhouse cultivation, were carried out. The myrcene content was detemined by gaschromatography.
2) Strain 14 of group 1 gave 4, 3% and 2.4% of myrcene content for field and greenhouse cultivation, respetively, which was extremely low compared with other strains belonging to the West Indian lemon-grass, Cymbopogon citratus STAPF. From this fact and various characters found in preceding studies, this strain seems to be the East Indian lemon-grass, Cymbopogon flexuosus STAPF.
3) Strain 6 selected from group 2 was characterized by giving the highest myrcene content of 15.9% and 12.9%.
4) Among strain 1, 4, 5, and 8 belonging to group 4, strain 1 showed relatively higher content of myrcene. The rest three strains, on the other hand, gave rather lower content of myrcene, and varietal differences were hardly recognized among them.
5) From the results mentioned above, the myrcene content may be regarded to be considerably characteristic of the strain and play an important role in the classification of lemon-grass strains.

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The paper reports a study of host range of the causal fungus of pineapple heart rot disease. The fungus, used to the study was collected in Ishigaki Island.
The young plants of pineapple, pepper, papaya, tomato, cucumber, carnation, Shun-giku (Chrysanthe mum coronarium), spinach, okra, chinese cabbage, balsampeor, peas, and beans were diseased with the inoculated fungus. The fruites of pineapple, papaya, tomato, balsampeor, pepper, eggplants, and cucumber were also diseased.
The diseased plants could be classified into three groups in the rate of area of leaf symptoms. The highest rate group contains pineapple (87%), tomato (87%), pepper (71%), and papaya (67%) . The plants belong to the second group are cucumber (23%), carnation (20%), Shun-giku (17%), and okra (14%) . Spinach (4%), chinese cabbage (2%), balsampeor (1%), peas (1%), and beans (1%) are the lowest group in the rate.
Eighty seven percent of inoculated pineapple plants, 71% of pepper, 63% of papaya, 57% of tomato, 22% of cucumber, 15% of carnation, 14% of Shun-giku, and 5% of spinach were died.
It might be said that the pineapple, pepper, papaya, tomato, cucumber, carnation, and Shun-giku could be the host plants of the fungus. Especially, the pineapple, pepper, papaya, tomato, young fruites of pineapple, mature fruites of papaya and tomato, and fruites of balsampeor seems to be important host plants.

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The author applied correlation coefficient as a means of manifesting morphologically the origin of the tea plant. The correlation coefficient was calculated by using 3 kinds of cultivated species and 6 kinds wild species grown in 6 districts of Taiwan as test materials and combining them with each other, then it was confirmed that they are all in complete posifive correlation.
Though morphological differences among these species are considerable, all the curves that the series of the correlation coefficient of them indicate are almost similar. As a result, it has become clear that all the tea plants grown in Taiwan have the same dominant species.
Among the test materials are included var. sinensis representing the temperant zone and var. assamica representing the tropical zone, but the var. assamica and var. burmensis were introduced to Taiwan in 1925, and they have become considerably small-sized with the species grown in Assam area of India and in Shan area of Burma respectively. It is therefore considered that there may have been variation due to the difference of environmental conditions.

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1) The flower of Banana is generally classified into:
a) flower at the base part of flower spiks which develops into fruit as swelling after efflorescence.
b) flower at a head part which falls by withering after efflorescence.
The former is usually called as female flower and the latter as male flower, but it was found that both have female and male organ and both are bisexual flower in structure.
2) In the sence described as above, the classification of Banana flower as being generally called as unisexural flower can be considered as not being pertinent. Botanically, the flower which develops into fruit is bisexual flower, and the flower at a head is the one which an ovary stagnated its development due to the shortage of the supply of nutrients. Therefore, it is thought pertinent that this should be called as intersexual flower.

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