Papilio nireus.

Paramoecium, Jennings on.

Parker, G.H., on Butterflies.

Parkin, J. and E.A.N. Arber, on the origin of Angiosperms.

Parthenogenesis, artificial.

Paul, H. and Wundt.

Pearson, K.

Peckham, Dr and Mrs, on the Attidae.

Penck.

Penzig.