一、引言从文献上知道有些有机汞杀菌剂如谷仁乐生(Kostoff,D.,1939),氯化乙基汞(Kostoff,D.,1940),磷酸乙基汞(Sass,J.E.,1937),醋酸苯汞(Sass,J.E.,1938)等具有加倍植物染色体数的作用。我們用上述四种药品和一种新的有机汞杀菌剂——富民农(或称富民隆),测驗了它們对黑麦和水稻发芽种子的影响。从这些药品对种子幼根根端的肿大情况看来,其中以富民农的效果最为突出。据我們所知,在文献中尚未报导过富民农对加倍植物染色体数的作用。因之关于这一药品对黑麦根端細胞有絲分裂的影响,对 I. INTRODUCTION It is known from the literature that some organic mercury fungicides such as Kostoff, D., 1939, ethylmercury chloride (Kostoff, D., 1940), ethylmercury phosphate (Sass, JE, 1937) Phenylmercuric acetate (Sass, JE, 1938) has the effect of doubling the number of plant chromosomes. We used the above four drugs and a new organic mercury bactericide, Fuminong (or Fufumon), to test their effect on germinating seeds of rye and rice. From these drugs on the roots of seedlings enlargement of the situation appears, among them the most prominent effect of enriching farmers. To the best of our knowledge, the role of rich peasants in doubling plant chromosome numbers has not been reported in the literature. Because of this drug on rye root cell mitosis, right