If you were to walk by my classroom at 9:01 a.m., you might see my math students out of their seats, moving their arms around and doing squats. It’s not because I’m trading in math time for aerobics.

THE work before us is the realization of the hope with which we concluded our notice of the first part (NATURE, vol. xxxiv. p. 614). Algebra: an Elementary Text-book for the Higher Classes of ...