Sentence:  [I]f a man doe really deem the weather to be cold, or that his body is diſtempered, he putteth on warmer cloathes, or taketh phyſick: although peradventure he is miſtaken in both: for his <WSD>deeming</WSD> them to be ſo, maketh him demeane himſelfe in ſuch ſort, as if really they were ſo. 
Meaning of the word marked with <WSD> tags:  To think, judge, or have or hold as an opinion; to decide or believe on consideration; to suppose.