TABLE OF CONTENTS. 



Page 



Title Page 1 



Letter of Transmittal 3 



Table of Contents 6 



List of Illustrations 7 



Officers for 1915-1916 9 



General Program rendered at the meeting of the Michigan Academy of Science held 



March 31 and April 1 and 2, 1915 H 



Papei"s puDlished m this report : 



Geography and Geology. 



Iceberg Lake, O. W. Freeman ' 19 



Sanitary and Medical Science. 



The Staining of Soil Protozoa, J. Franklin Morgan 25 



Economics. 



The Equity of Profit, Rufus Farringtou Sprague 31 



An Interpretation of the Working Rules of the Carpenters' Unions of Chicago, 



Edward M. Arnos ^ 40 



Zoology. 



Peculiar Nesting Behavior of a Robin, Bertram G. Smith : 71 



Notes on the Late History of the Germinal Vesicle in Cryptobranchus AUeghenien^is, 



Bertram G. Smith 73 



Note on the Proportion of the Sexes in the Whitefish, Raymond Pearl 76 



The PiCparation of Serial Sections of Frog Embryo, Bertram G. Smith 77 



■ The Porifera, Oligochaeta, and Certain Other Groups of Invertebrates in the Vicinity 



of Douglas Lake, Michigan, Frank Smith and Bessie R. Green 81 



Botany. 



Cucumber Scab, S. P. Doohttie 87 



An Undescribed Bark Canker of Apple and the Associated Organism, G. H. Coons. . 117 



The Michigan Plant Disease Survey for 1914, G. H. Coons 123 



Light and Pycnidia Formation in the Sphaeropsidales, Ezra Levin 134 



Some Factors Concerned in the Germination of Rust Spores, E. B. Mains 136 



Some Cultural Characteristics of Pestcdozzia Funera, Desm., P. V. Siggers 141 



The Origin of the Anthophyta: Ernst A. Bessey 142 



Helicostylum and Cunninyhamella: Two genera of the Mucorales new to the State, 



Alfred H. W. Povah 152 



Growing Alien Cacti in Michigan, W. E. Praeger 156 



Does the Movement of Air Affeci the Growth of Plants, Alma HoUinger 159 



The Relation of the Storage of the Seeds of some of the Oaks and Hickories to their 



Germination, C. C. Delavan 161 



Dr. Real's Seed Vitality Experiments, H. T. Darlington 164 



Contributions to the Botany of Michigan, No. 14, Oliver Atkins Farwell 167 



The Effect of Fungicides on an Apple Rot Due to Longyear's Alternaria, R. W. 



r^, Goss and S. P. Doolittle 183 



^ An Epidemic of Cronartium Comploniae at the Roscommon State Nurseries, C. H. 



Kauffman and E. B. Mains 188 



, -., Sterilization of Pop Corn, Reed O. Brigham 190 



"^ Unreported Michigan Fungi for 1911 to 1914, C. H. Kauffman 194 



A Preliminary List of the Bryophytes of Michigan, C. H. Kauffman ; . . . . 217 



