He heard about the botany book written by John Jonston from Dutch residence who resided in Edo and he wrote the "Oranda Honzo Wage" (Dutch Botany Explained in Japanese), the first natural history book in Japan.
さらに江戸参府中のオランダ人からヨンストンの本草書の存在を聞いて、日本最初の西洋博物学書ともいうべき『阿蘭陀本草和解』を著した。