In Rome Castelnuovo was a colleague of Cremona but although he had given up active research he was still teaching the Higher Geometry course despite the fact that he had "not been interested in science for a long time", as Veronese had commented five years earlier.
Sa mga Roma Castelnuovo ay isang kasamahan ng Cremona ngunit kahit na siya had given up research niya ay aktibo pa rin ang pagtuturo ng mas mataas na geometry kurso sa kabila ng katotohanan na niya "hindi na interesado sa Agham para sa isang mahabang oras", bilang Veronese had commented limang taon na mas maaga.