CONTENTS. IX 



PAGE 



Polar Globules and other Elements eliminated from the 



Ovum Part 4 535 



Embryonic Germinal Layers and the Tissues , 538 



Origin of the Mesoblast of Cartilaginous Fishes „ 538 



Intra-cellular Digestion in the Germinal Membrane of 



Vertebrates „ 539 



Larval Theory of the Origin of Cellular Tissue „ 540 



Development of Protovertebros „ 541 



Experiments in Arrested Development „ 541 



Morphology of the Directive Corpuscles „ 541 



Morphology of the Pineal Gland „ 542 



Segmentation of the Vertebrate Body „ 543 



Embryology of Alytes obstetricans „ 544 



Development of the Nervous System of Forella , 546 



Incubation of Eggs in Confined Aii — Influence of Ventilation 



on Embryonic Development „ 546 



Embryology of the Sheep Part 5 704 



Development of the Generative Organs „ 705 



Spermatogenesis „ 706 



Factors of Sexuality „ 708 



Rudimentary Placenta in Birds „ 709 



Permanence of La rval Conditions in Amphibia „ 710 



Embryo Fishes „ 711 



Development of Viviparous Minnows „ 712 



Formation of and Reaction of Nuclei . , .. „ 713 



Indirect Nuclear Division „ 713 



Nucleus of the Auditory Epithelium of Batrachians , . .. „ 715 



Epidermis of the Chick „ 715 



Scales, Feathers, and Hairs „ 716 



Locomotion of Animals over smooth Vertical Surfaces . . „ 716 



Zoology of the Voyage of the ' Alert' „ 718 



Physiology of Protoplasmic Movement Part 6 859 



Power of Reducing Silver possessed by Animal Protoplasm „ 861 



Fcetus of Gorilla , 861 



Influence of Magnetism on the Development of the Embryo „ 861 



Blastopore of the Newt „ 862 



Natural and Artificial Fertilization of Herring Ova . . . . „ 862 



Development of Pelagic Fish Eggs „ 863 



Cell-division, the Relation of its direction to Gravity and 



other Forces „ 865 



Aspects of the Body in Vertebrates and Arthropods ,. .. „ 866 



Observations on Vegetable and Animal Cells „ 914 



B. — Invertebrata. 



Nerve-centres of Invertebrata Part 1 32 



Tracks of Terrestrial and Fi-esh-water Animals „ 34 



Growth of Carapace of Crustacea and of Shell of Mollusca „ 34 



Symbiosis of Algas and Animals „ 35 



Annelid Commensal ivith a Coral Part 2 204 



Intra-cellular Digestion of Invertebrates Part 3 363 



Effect of High Pressure on the Vitality of Micro-organisms Part 4 547 



