94 THE SHORTER SCIENTIFIC PAPERS 



nearly the normal position of the nucleus. It was not 

 until 1:45 P. M. that the division of the stigma was ob- 

 served, the nucleus in the meantime having become ob- 

 liquely elongated, and the anterior paramylon granule 

 having moved down to a position beside the posterior 

 granule. At 3:3 5 P. M. division had so far progressed 

 that the anterior fourth of the individual — individuals? — 

 were separated, the two nuclei being almost distinct. At 

 4:15 P. M. longitudinal division was nearly complete and 

 the two nuclei were moving slowly posteriorly to their 

 normal position. At the same time a peculiar phenomenon 

 was taking place in connection with the two paramylon 

 granules. The protoplasm containing the granule of the 

 individual on the left would rapidly flow posteriorly, so 

 that the granule was actually in the posterior end of the 

 individual on the right as indicated by the solid arrow. 

 The time consumed was 20 seconds. Then the reverse 

 flow occurred and the protoplasm containing the granule 

 of the individual on the right would flow to the left as 

 indicated by the dotted arrow. It would seem at times 

 as if an observer could scarcely refrain from concern as 

 to the probability that one individual would inherit all 

 the paramylon. At 4:25 P. M. the process of division 

 was completed, the nuclei having moved posteriorly and 

 the individuals appearing normal in every way with the 

 exception that each lacked the large anterior paramylon 

 granule. Observations were made periodically the fol- 

 lowing day with the expectation of noting the develop- 

 ment of the new granule. It was, however, not until the 

 succeeding day at 9:00 A. M., approximately 40 hours 

 from the time of the complete division that an irregular, 

 but distinct granule became visible. This gradually in- 

 creased in size, but had not attained its full development 

 at the end of the day, when the observations were brought 

 to a close. The other twin individual had in the mean- 

 time disappeared. 



There are two factors, however, which may have been 

 instrumental in delaying the formation of the anterior 

 granule, the lowering of the room temperature nearly to 

 freezing at night, and the possible lack of the necessary 



