Table 3.

This table refers to Experiment  1b and lists mean values and standard errors (n = 20) of the absolute population size of Paramecium caudatum at the end of the exposure to Euglena viridis or its absence (yes/no). The separation between the species was conducted with cuvettes made of quartz and had two types of controls (normal and shielded; see text).

Exposure to Euglena	Shielding	Mean ± standard error
Yes	No	187.0 ± 6.2
Yes	Yes	208.5 ± 10.4
No	No	201.7 ± 7.9