This is a rather surprising study. To understand how the different parts of the cell contributes to Paramecium’s behavior, Jennings and Jamieson decide to cut paramecia in two “with a small knife” (no more details!). They find that the anterior and posterior halves basically behave the same (and the middle third too), except the posterior half is a bit slower. They swim in spiral with the aboral side facing outside. They give the same kind of avoiding reaction, with backward swimming and turning to the aboral side. This is somewhat a contradiction of previous descriptions of Jennings. He previously wrote that the turning to the aboral side is due to the locomotor cilia of the anterior end striking transversely toward the oral groove. This may not be the case. The fact that the oral side faces the axis of the spiral may also not be due to the oral cilia. Thus, there is still some uncertainty about how the movements of Paramecium are produced by its cilia.