Abstract
The present paper deals with three types of meiotic chromosomes in Trillium kamtschaticum: normal, abnormal I and abnormal II (cf. Text-fig. 1), the latter two having arisen through the effects of abnormally high temperature. In abnormal I, the chromosomes are shorter but broader than those of normal, their volume however remaining unaffected (cf. Tables 2 and 3). Abnormal II type is characterized by the appearance at MI of four chromatid strands associating together in place of a geminus. The volume of chromatids of this type is much reduced (about 66% of the normal), their length being half that of normal chromatids and their diameter nearly equal to that of abnormal I ones (cf. Tables 2 and 3).
The coil numbers in these three types were studied and compared with one another in connection with the volume of ehromosomes or chromatids (cf. Table 1), and were explained by assuming that the inclination angle of the ehromonema remain constant throughout the three types (cf. formulae (4) and (5), and Tables 4 and 5).
