This suspicion receives some slight support from the fact, of which I am assured by Mr S. that the m. in the z. Gardens often vomit [‘; & that [interl and del] they do so’ del] when in good health, which looks as if [‘this was effected’ del above del ‘they could vomit’] it was done voluntarily, [‘they’ del] we can see that with [mankind] owing to *his power of teaching [pencil, after del pencil ‘handing down’, above del ‘the acquisition of language & the [interl] tradition’] knowledge, *by [communicating] [pencil, above del ‘the power of voluntarily throwing up of’] what food to avoid there would be less occasion *than with *some of [interl] the [inferior] [del & restored] [animals] to use the faculty [above del ‘power’] of voluntarily throwing up food from the [stomach]; so that the power w^d tend *through disuse [interl] to be lost.—³