CONTENTS OF No. 263. —New Series. 



MEMOIRS : page 



Further obseivations on Chromosomes and Sex-determination in 

 Abraxas grossulariata. By the late Prof. Ij. Don'CASTEH, 

 FR.S., University of Liverpool 397 



The Infra-cerebral Organs of Peripatus. by William J. Da kin, 

 D Sc, F.Z.S., F.L.S., Derby Professor of Zoology, University of 

 Liverpool. (With 4 Text-figures) 409 



A Critical Study of the Facts of Artificial Fertilization and Normal 

 Fertilization. By J. Gray, M.A., Fellow of King's College, 

 Cambridge. (With 1 Text-figure) 419 



Calma Glaucoides : A study in adaptation. By T J. Evans, M.A, 

 (Oxon.), Lecturer in the Medical Snhool, Guy's Hospital, London 

 University. (With Plato 11 and 3 Text-figures) . , . .439 



The Segmentation of the Head in S q u a 1 u s a c a n t h i a s. By G. 

 Rylands de Beek, B.A., B.Sc , Demonstrator in the Department 

 of Zoology and Comparative Anatomy, University Museum, Oxford. 

 (With 13 Text-figures) 457 



Some Notes on the Gametogenesis of Ornithorhynchus Paradoxus. 

 By .1. Bronte Gatenby, M.A., D.Phil. -(Okob.), ^.fye. ^hrmd.y, 

 Professor of Zoology and Comparative Anatomy, Dublin University. 

 (With Plates 12, 13, 14, and 1 Text-figure) 475 



Note on the Comparative Effects on Tissues of Isotonic Saline and 

 Distilled Water when used as Solvents for Mercuric Chloride and 

 Formol in Histological Fixation. By H. M. Carleton, Lectui-er 

 in Histology, University of Oxford 501 



On the Structure of the Alimentaiy Canal and its Ferments in the Bee 

 (Apis mellifera L ). By £. N Pavlovsky, M.D., D.Sc, 

 Professor at the Military Academy of Medicine, Petrograd, and 

 E. J. Zarin, M.Phar.. Professor at the University of Latvia, Riga. 

 (With 3 Curves and Plates 15, 16, 17) 509 



Mr. Ji/ilford, Oxford University/ Press, Amen Comer, London, E.G. 4, will he glad tj 

 receive offers for hack numlers of the Quarterly Joum<d of Microscopi ad Science. 



H. K. LkWIS Ck CU- LTDi, technical booksellers. 



Text books and Works in General, Technical, and Applied Science of all Publishers. 



Orders hy Post or Telephone promptly attended to. 



. . { Phone: 1 



Large Stock of SECOND-HAND Books at greatly reduced prices J MUSEUM - 



at 140 Gower Street. Catalogue Post Free on Application. { 4031. I 



SCIENTIFIC AND TECHNICAL CIRCULATING LIBRARY. 



Annual Subscription, Town or Country, from One Guinea. 



LIBRARY, READING and WRITING ROOM (First Flook) OPEN DAILY TO SUBSCRIBERS. 



136 GOWER STREET and 24 GOWER PLACE, LONDON, W.C. 1. 



Telcpraius : ' PUBLIC AVIT, EUSROAD, LONDON.' Telephone: MUSEUM, 1072. 



