Patterson, Carlile Pollock, [325], [326]

Peirce, Charles Sanders, [314], [322], [332], [336], [342], [345]

Peters, C. A. F., [322], [324]

Picard, Abbé Jean, [306], [308], [342]

Plantamour, E., [319], [324]

Posidonius, [306]

Preston, E. D., [328], [329]

Putnam, G. R., [339]

Pythagoras, [306]

Repsold, A., and Sons (Hamburg), [320], [322], [338], [339], [346]