MAY 12 1898 
CONTENTS. 
TRANSACTIONS OR THE SOCIETY. 
PAGE 
IIL—The President’s Address. By Edward M. Nelson. (Fig. 26) 121 
IV. — A Microscope with New Focussing Mechanism. Designed 
by Keith Lucas. (Figs. 27 and 28) .. 139 
NOTES. 
Notes on Colour Illumination, with Special Reference to 
the Choice of Suitable Golours. By Julius Rheiuberg. 
(Fig. 29) 112 
SUMMARY OF CURRENT RESEARCHES . 1 
ZOOLOGY. 
VERTEBRATA. 
a. Embryology. 
Ewart, J. C . — Experiments on Heredity 147 
Beard, J . — Functions of the Thymus » 148 
Hertwig, O . — Experimental Embryology . .. .. 148 
Morpurgo, B. — -Post-Embryonic Development of Striped Muscle .. .. .. 149 
Gadow, H . — Orthogenetic Variation in Chelonia 149 
Stoeckel, W. — Division- Processes in Primordial Ova of an Adult 149 
Peter, K . — Nutritive Cells in Spermatogenesis 149 
Sellheim, H . — Effects of Castrating Cocks and Hens .. 150 
Charrin, A . — Passage of Toxins from Foetus to Mother • 150 
Klaatsch, H . — Intercellular Bridges in Development of Amphioxus 150 
Nishikawa, T . — Embryos of Chlamydoselachus 150 
Noldeke, B . — Endocardiac Epithelium of the Salmon .. .. 151 
Bernstein, Z . — Theory of Growth and Fertilisation 151 
Spencer, Baldwin, & G. Sweet — Hairs of Monotremes 15 L 
Schmidt, R. — Bone-Structure and Inheritance 151 
h. Histology. 
Peter, K . — Ciliary Movement 151 
Lindemann, W . — Secretory Phenomena in Poison-Gland of Adder 151 
Dekhlyzen, M. C . — Red Blood- Corpuscles of Lamprey 152 
Weiss, O. — Skin-Glands of Toad 152 
Wlassak, R . — Origin of Myelin . 152 
c. General. 
Mann, G . — Nature of Life 152 
Toni, G. B. de — Food of Marine Fishes 153 
Zach arias, O. — Winter- Plankton in Large and Small Basins 153 
Dewitz, J . — Fauna of Wadi Natroun 153 
Tunicata. 
Crampton, H. E., Jun. — The Ascidian Half -Embryo 153 
1899 A 
