To JOHN EVELYN, Esq. 



Sir, 



The Council of the Royal Society, considering with themselves 

 the great importance of having the Public Meeting of the said Society 

 constantly provided with entertainments suitable to the design of their 

 Institution, have thought fit to undertake to contribute each of them 

 one ; not doubting but that many of the Fellows of the Society will join 

 with them in carrying on such an undertaking : and being well per- 

 suaded of your approbation of this their purpose, (so much tending to the 

 reputation and support of the Society,) they desire that you would be 

 pleased to undertake for one ; and to name any Thiu'sday after the 

 fourteenth of January next, such as shall be most convenient for you, 

 when you will present the Society at one of their Public IMeetings, by 

 yourself, or some other of the Fellows for you, with such a Discourse, 

 (grounded upon, or leading to, Philosophical Experiments,) on a subject 

 of your own choice. In doing of which you will benefit the Society, 

 and oblige, 



Sir, 



Your humble Servant, 



BROUNCKEK, P. R. S. 



London, Dec. 28, 1674. 



