He strategically invited Prince Mahidol to a boat trip along the Bangkok Yai and Bangkok Noi canals. His office, Siriraj Hospital, was certainly on the route, and this was where he invited his half-brother to stop and have a look around. Having seen Mahidol's reaction to the poor state of the hospital, Prince Rangsit asked him if he wanted to help; Mahidol's answer at that time was, however, not very positive as he was concerned that he knew nothing about medicine. However, a few days elapsed and he agreed. He also decided he would study in the related fields himself.