SCIENCE

A TREATISE ON ZOOLOGY. By Prof.

Sir E. Kay Lankester, K.C.B., M. A., LL.D., F.R.S. ïo bo coinpletcd in 10 vols. Demy Svo, illu.strated.

New ready, price, each, 12s. 6d. net, in paper covers ; or 15S. net, in cloth :

Part I. (Kirst Fascicle). Introduction and Protozoa. By Prof. s. J.

HiCKsoN, M.A., l'.H.S. ; F. W. Gamble, D.Sc., F.R.S.; J. J. Lister, F.R.S. ; H. M. WooDcocK, D.Sc. ; and the late Prof. Weldon.

Part I. (Second Fascicle). Introduction and Protozoa. By j. i;.

Farmer, D.Sc, M. A., F.R.S. ; J. J.

Lister, F.R.S.; E. A. Minchin, M.A. ; and S. J. HiCKsON, F.R.S.

Part II. The Porifera and Cœlentera. iîy E. A. Minchin, m. a.; G. Herbert Fowler, B.A., Ph.D. ; and Gilbert C. Bourne. M.A.

Part III. The Echinoderma. By

F. A. Bather, m. A., assistcd by J. W.

GREGORY,D.Sc..andE.S.Goorii!icH,M.A.

Part IV. The Platyhelmia, the

Mesozoa, and the Nemertini. By

Prcif. i3KNlIAM, D.Sc.

Part V. Mollusca. By Dr. Paul

PlL.SE.VEEB.

Part VII. (Third Fascicle). Crustacea. By w. t. Calman, D.Sc

Part IX. (First Fascicle). CyclOStomes and Fishes (Vertebrata Craniata). By i;. s. Gooukhh, f.r.s.

Price, l'art L\., 15s. net, paper covers ; or 20s.net, in cloth.

DYNAMICS. By Prof. P. G. Tait. Illiistratcd. Crown .Svo, cloth, priée 7S. 6d.

THE GRAMMAR OF SCIENCE. By

Professor Karl Peakson, Jl.A., F.R.S.

Third Edition. With 33 figures in the text. Deniy Svo, cloth. Part \. :

Physio.al (now ready). Pi-ice 6s. net.

Part II. : Biolofjical (in ))reparation). Price 4s. 6d. net. Or complète iu one volume. Priée lOS. 6d. net.