CONTENTS. 



ECONOMICS. 



Page 



An Agricultural Business Problem, Charles S. Dunford 15 



Some Aspects of Municipal Accounting, Franlv F. Kolhe 22 



A Contribution to the Theory of Tax Shifting, R. S. Tucker 30 



Botany. 



Pathophytes and Pharmacophytology, A. D. Bush 43 



A Simplification of the Present Freezing Point Method (Abstract), O. E. Harrington 



and R. P. Hibbard 47 



A Simplified Apparatus for Measuring the Conductivity of Electrolypes, R. P. Hibbard. 49 

 The Influence of an Incomplete Culture Solution on Photo-Synthesis (Abstract), O. M. 



Gruzit and R. P. Hibbard 50 



The Hormone Theory of Chromosome Action, Ernst A. Bessey 53 



The Sexual Cycle in Plants, Ernst A. Bessey 59 



Fern Notes, Oliver A. Farwell 78 



A Convenient Method of Washing Fixed Preparations, Richard DeZeeuw 94 



Zoology. 



Notes on Pleodorina Californica Shaw, Bertram J. Smith 99 



The Process of Ovulation in Amphibia, Bertram ,1. Smith 102 



Periodical Literature and Publications of Learned Societies of Interest to Zoologists 



contained in the University of Michigan Library, Robert W. Hegner 106 



Illustrations. 



Figure 1. Lotsy's diagrammatic scheme to illustrate his idea of the relationship of the 



various groups of plants 60 



Figure 2. Union of similar gametes of Hydrodictyon. (After Coulter) 61 



Figure 3. Sexual cycle in Metazoa and in Fucus. RD = Reduction division, CU =Cell 



union, NU =Nuclear union, G =Point of gamete formation 67 



Figure 4. Probable sexual cycle of Ulothrix, Oedogonium, Desmidiaceae, Spirogyra, etc. 67 

 Figure 5. Sexual cycle of such Florideae as possess a distinct tetrasporic generation. 



C = Point at which carpospores are formed 69 



Figure 6. Sexual cycle of Nemalion 69 



Figure 7. Sexual cycle of Mosses and Ferns. SP = Point of spore production 70 



Figure 8. Sexual cycle of Flowering Plants 70 



Figure 9. Sexual cycle in Pyronema 72 



Figure 10. Sexual cycle in the Rusts 72 



Figure 11. Sexual cycle in Tilletia 73 



Figure 12. Sexual cycle in Agaricales 73 



Figure 13. Botrychium multifldum var. dichotomum 87 



Figure 14. Tank for washing fixed preparations 95 



