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show that he has high authority for his inertia-force.But that Newton's ?;is insita or ?;is inevtiae is quite a different thing from Hall's inertia-force, will be evident from the following quotations : " Haec " [vis insita] " semper proportionalis est suo corpori, neque differt quicquam ab inertia massae, nisi in mod0 concipiendi " (Newton's Prir~cipia, comment on clef. 111) ; and " Inertia and inertia-force must be carefully distinguished " (H;ll's pamphlet, 13. 6).Minchin's ' force of inertla is just D'Alembert's ' effective force,' and is not a force at all, but simply the name given to the product O F the mass of a particle into its acceleration.

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