CONTENTS 
Page 
Paleontology.— On Some Fundamentals of Pre-Cambrian Paleo-Geography 
By. Rudolph Ruedemann 1 
Chemistry. — ^The Inorganic Constituents of Lobster Shells 
By Frank Wigglesworth Clarke and George Steiger 6 
Zoology. — Flagellate Affinities of Trichonympha 
By Charles Atwood Kofoid and Olive Swezy 9 
Chemistry.— The Ternary System CaO-MgO-Si02 
By J, B, Ferguson and H, E. Merwin 16 
Genetics. — Quantitative Relations Between Chromatin and Cytoplasm in the 
Genus Arcella, with their Relations to External Characters . . . 
By R, W. Hegner 19 
Mathematics. — Theorem on Power Series, with an Application to Con- 
formal Mapping 
By T. H. Gronwall 22 
