His lecture Concerning the system of the Earth, its duration, and stability was delivered by his friend Joseph Black. Hutton was well enough to deliver the second of his lectures four weeks later on 4 April.
Kanyang panayam tungkol sa sistema ng Earth, ang tagal, at katatagan ay inihatid sa pamamagitan ng kanyang mga kaibigan Joseph Black. Hutton ay mabuti sapat na upang ihatid ang pangalawang ng kanyang mga lektura apat na linggo mamaya sa April 4.