E.B. Holt 1915 book continues to be central to my scholarship. Appended to the book are two articles Holt had published the prior year, on "Response and Cognition." There is much overlap between the works, but in a few places I think the articles add significantly. One is in discussion of explanations that Holt disparagingly calls "Bead Theories", characterized by description of a series of events with no reference to the fact that a larger thing is happening. He begins by describing the how other sciences used to be in the same "unstable" state as psychology, and 100 years later, psychology seems to me not to have improved. Remember that a book published in 1915 must have been started quite a bit before Watson's Manifesto, and that this book was influential in the professional development of J.J. Gibson, B.F. Skinner, and J. Jastrow, along with most others who trained at Harvard in the teens or Princeton in the '30s. Indeed many core aspects of Gibson's Ecological Psychology, and Skinner's attempt to separate of "Psychological" questions from "Neurological" questions can be seen here decades earlier:
Before
proceeding … we shall probably find useful an illustration from another
science, which was once in the same unstable state of transition as psychology
is now. In physics a theory of causation once prevailed, which tried to
describe causal process in terms of successive ‘states,’ the ‘state’ of a body
at one moment being the cause of its ‘state’ and position at the next. Thus the
course of a falling body was described as a series of states (a, b, c, d,
etc.), each one of which was the effect of the state preceding, and cause of
the one next following. This may be designated as the ‘bead theory ' of
causation. In asmuch, however, … [the states] gave no clue toward explaining
the course or even the continuance of the process, an unobservable impetus (vis viva, Anstoss, ‘force') was postulated. This hidden impetus was said to
be the ultimate secret of physical causation. But, alas, a secret! For it
remained, just as the ‘consciousness’ of one's fellow-man remains today in
psychology, utterly refractory to further investigation.