Their study circle further grew with the occurrence of the Morrison Incident, involving Dutch scholars (a person who studied Western sciences by means of the Dutch language), with Choei, Sanei KOSEKI and Kanae HATAZAKI, the shogunate retainer Toshiakira KAWAJI, Kando HAKURA and Hidetatsu EGAWA (Tarozaemon) being members, covering a range of themes to discuss in detail, even extending to issues of naval defense.
その後この学問サークルはモリソン号事件とともにさらに広がりを見せ、蘭学者の長英や小関三英、幡崎鼎、幕臣の川路聖謨、羽倉簡堂、江川英龍（太郎左衛門）などが加わり、海防問題などで深く議論するようになった。