He paid careful attention to the history of optics and presented excellent explanations of early optics experiments, but his mathematical deficiencies caused him to dismiss several important contemporary theories.
Ia memperhatikan secara saksama pada sejarah optika dan memberikan penjelasan yang sangat baik dari percobaan optika awal, namun kekurangan matematisnya membuatnya menghilangkan beberapa teori kontemporer yang penting.