yiii CONTENTS. 



Summary of Current Kesearches relatin'G to Zoology and Botany (princi- 

 pally Invertebrata and Cryptogamia), Microscopy, &c., including 

 Original Communications from Fellows and Others.* 



34, 189, 343, 487, 629, 821 



ZOOLOGY. 



A —General, including Embryology and Histology of the Vertebrata. 



PAGB 



Sudden Destruction of Marine Animals Part 1 34 



Apparent Bird-tracks by the Sea-shore „ 34 



Development of the Ovum of Arvicola arvalis Part 2 189 



Formation of the EmhrijoniG Layers in the Trout . . . . „ 190 



Distinctions between Organisms and Minerals „ 190 



Mesoblast of Vertebrata Part 3 343 



Inversion of Blastodermic Layers in Rat and Mouse . . . . „ 345 



Spennatozoon of the Neict „ 345 



Development of the Red Blood-corpuscles „ 345 



Origin and Destiny of Fat-cells „ 346 



Embryology of the Milk-glands „ 346 



Caudal End of Vertebrate Embryos „ 347 



Influences which determine Sex in the Embryo „ 348 



Sense of Direction in Animals „ 349 



Cerebral Homologies in Vertebrates and Invertebrates . . „ 349 



Early Stages of the Guinea-pig Ovum Part 4 487 



Activity of the Yolk during Impregnation „ 488 



Germ-layers and Gastrula of the Mouse ,, 488 



Embryology of Mice , 489 



Embryology of Rodents „ 489 



Origin of the Vertebrate Mesoderm „ 489 



Histology of the Ovary of Mammals „ 490 



Histogenesis of Nerve-fibres „ 491 



Olfactory Lobes in Vertebrates and Higher Arthropoda . . „ 491 



Colouring Matter of Egg-shells , 491 



Presence of Glycogen in Embryos of Squalidce „ 493 



Biological Studies „ 493 



Aspects of the Body in Vertebrates and Invertebrates . . Part 5 629 



Ancestral Form of the Chordata „ 629 



Hypophysis cerebri in Vertebrata and Tunicata „ 630 



Origin of the Follicular Cells „ 630 



Cells of the Ovarian Follicle „ 631 



Bizzozero's New Blood-corpuscle and Norris's Third Cor- 

 puscular Element „ 631 



Colour-Markings of Mammals „ 631 



Retina of Ganoids „ 632 



Influence of Sea-water on Fresh-water Animals, and of 



Fresh-water on Marine Animals „ 632 



Development of Muscle-fibres and their union with Nerves . . I'art 6 821 



Cell Theory „ 822 



Xanthochroism of Parrots „ 825 



* Id order to make tlie classification complete, (1) the papers printed in the 

 • Transactions,' (2) the abstracts of the Bibliography, and (3) the notes printed 

 in the ProceedingB are included here. 



