Kammala jumla mai zuwa: Saboda haka Halbertsma ya yi tsammanin za a nada shi farfesa na yaren Dutch da adabi, kuma sau da yawa irin wannan alƙawari ya zama kamar yana kusa da shi, amma duk lokacin da ya ɓace. Fensir dinsa mai kaifi mai yiwuwa ya taka rawa a wannan, amma akwai wasu dalilai, ma. A 1830, ya rasa daga yawan adadin masu neman takardun da ke wankewa a Netherlands daga jami'o'in Belgium, wanda a wannan lokacin ya kasance kawai
An raba shi daga United Kingdom na Netherlands, kuma bayan 1840 an kira wani nau'in masanin kimiyya daban-daban, tare da ƙarin ilimin musamman fiye da Halbertsma. Cewa a cikin 1837 an ba shi lambar yabo ta girmamawa a cikin adabi daga Jami'ar Leiden, ba ta da ta'aziyya a gare shi. A wani bangare saboda wadannan abubuwan takaici, Halbertsma ya daidaita a gefen ƙonewa na dogon lokaci, kuma musamman a 1839, lokacin da aka sake wuce shi, ya shiga cikin mawuyacin hali. A cikin shekarun 1860 ne kawai, lokacin da yake cikin shekarunsa saba'in, da alama ya sami kwanciyar hankali.