In some cases we find that a certain phonemic feature correlates with morpheme boundary, but has varying positions or values within various morphemes (e.g. free or partially bound word stress), so that from the sound feature alone we cannot tell exactly where among the phonemes the boundary must occur. And if the phonemic feature always occurs a fixed number of times (e.g. once, for main stress) within each morpheme or construction (e.g. word), we can tell from the number of occurrences of that feature in our utterance how many morphemes (or constructions) there are in the utterance.
- Harris (1951), a pag.176, n.45

It may be noted that some phonemic features are common to several of the morphemic segments which contain a particular component.
- Harris (1951), a pag.317, n.33

In many languages such special phonemic features occur at the boundaries of various sequences, components, or constructions, including constructions one of which occurs within the other. The special phonemic features at these boundaries in some cases are the same as those at other boundaries, and in other cases are different. In some cases, a special phonemic feature occurs both at the boundary between morphemes and at some or all boundaries between the larger stretches.
- Harris (1951), a pag.344

In many languages there are phonemic or phonetic features which extend over the length of various morphological domains. E.g. in English and in other languages, the constructions which sometimes occur by themselves […] have exactly one loud stress; and in general no stretch of speech contains precisely one loud stress except one of these.
- Harris (1951), a pag.345