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|Abstract=This paper attempts to establish the existence of ''element decay'' by making an historical case for the existence of ''theory decay'', a phenomenon where theories leave an agent’s mosaic without any re-evaluation or decision on the agent’s part. The phenomenon of theory decay is to be theoretically distinguished from ''rejection without replacement''; while the latter is a result of an agent’s deliberation, the former is a result of an agent’s inaction. To locate historical instances of theory decay, there should be evidence that the agent under study existed continuously throughout the period under study, that the theory was accepted at some point and unaccepted at some later point, and that the theory left the mosaic without any decision on the part of the agent. With these indicators at hand, I discuss five potentially promising historical cases: Poisson distribution, the Aharonov-Bohm effect, Damascus steel, Greek fire, and Cremonese violins. I argue that there is solid historical evidence to interpret the latter as an instance of element decay, which is sufficient to establish the existence of the phenomenon. I show that element decay is best seen as a ''non-scientonomic'' phenomenon; its existence highlights that individual and communal agents have limited capacities of knowledge retention and transmission and, when these limits are reached, element decay often takes place. This suggests that sufficient epistemic capacity to retain and transmit knowledge is a necessary precondition for the existence of scientonomic patterns, which emerge and hold only when the agent has measures in place to counteract potential element decay.