The mechanisms of anti-vertigo and anti-vomiting effects of phenergan is unkown.It is assumed that the effects are based on the anti-coline effect of phenergan.
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It is assumed in this article that the concept of Fenggu is abstract but not concrete, illegible but not legible, extentive but not intentive, unifiable but not antinomic.
To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.