Applying his career interest in medicine to his favorite hobby, he began to specialize and collect only those stamps pertaining to bacteriology, whether they be stamps depicting the bacteria, the scientist who discovered it or the cure.
他按照郵票內容，有系統地將某種病症致病的病菌、傳染病症的病媒、發現病菌的科學家、發明治療方法的醫學家…… 等逐一排列，再配合親手撰寫的精簡說明，使他的集子就像一本生動活潑的細菌學史。