On 31 July 1726, Nicolaus died of appendicitis after spending less than a year in Russia, and when Daniel assumed his brother's position in the mathematics/physics division, he recommended that the post in physiology that he had vacated be filled by his friend Euler.
Kemudian pada 10 Juli 1726, Nicolaus meninggal akibat apendisitis yang telah menjangkitinya selama satu tahun di Rusia, dan saat Daniel harus mengisi posisi saudaranya di divisi matematika/fisika, dia menyarankan bahwa salah satu bagian di bidang fisiologi yang kosong ditempati oleh temannya, Euler.