Abstract
An apparent uncertainty exists in literature dealing with the cause for the peculiar deposition of dust on plaster and lath walls wherein the course of the laths and rafters behind the plaster is outlined in dust, popularly called ``lath marks.'' Conclusive experimental proof of a thermal cause is given which is in agreement with the general theory of the behavior of small particles suspended in an atmosphere in which a temperature gradient exists. Experimental evidence is produced to show that this phenomenon may be reduced to a negligible degree by thermal insulation.

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