Galileo had written to Castelli but, since Castelli was away from Rome at the time, his secretary Torricelli wrote to Galileo to explain this fact. Torricelli was an ambitious young man and he greatly admired Galileo, so he took the opportunity to inform Galileo of his own mathematical work. Torricelli began by Galileo Galileo that he was a professional mathematician and that he had studied the classical texts of Apollonius, Archimedes and Theodosius .
Galileo ay nakasulat sa Castelli ngunit, dahil Castelli ay ang layo mula sa Roma sa panahon, ang kanyang secretary Torricelli wrote sa Galileo na ipaliwanag ang katotohanan. Torricelli ay mapag-adhika ng isang binata at siya malaki admired Galileo, kaya siya kinuha ng pagkakataon upang ipaalam sa Galileo ng kanyang sariling matematiko trabaho. Torricelli nagsimula sa pamamagitan ng Galileo Galileo na siya ay isang propesyonal na dalubbilang at na-aralan niya ang klasiko teksto ng Apollonius, Archimedes at Theodosius.