"Scientific basis" has to refer to correct science. There is no "scientific
basis," for example, for Homer's description of the voyage of Odysseus to
the Underworld; it wouldn't do to merely argue that _Homer_ thought it was
Here, What Eliot or any of his contemporaries thought about feelings or
emotions can be used to gloss the poem, but cannot be used to argue a
"scientific basis" for anything.
Neuroscientists are still debating just what constitutes an emotion or a
feeling. Damasio, for example, defines "emotion" as a bodily (physical)
state and "feeling" as a recognition of that state. And if I remember
correctly, he argues that this was the theory William James advanced.