TABLE OF CONTENTS. 
PAGE. 
Officers of the academy - 1 
Membership of the academy 3 
Proceedings of the ninth annual meeting 7 
Report of the secretary-treasurer 8 
Report of the librarian 9 
Constitution 10 
Articles of incorporation 11 
Address of retiring president; Recent advances in the theory of solutions; Launce- 
lot W. Andrews 13 
Interloessial till near Sioux City, Iowa; J. E. Todd and H. Foster Bain 20 
Preglacial elevation of Iowa; H. Foster Bain. 23 
Secular decay of granitic rocks; Charles Rollin Keyes 27 
Record of the Grinnell deep boring; Arthur J. Jones 31 
Lansing lead mines; Arthur G. Leonard 36 
How old is the Mississippi? F. M. Fultz 39 
Maquoketa shales in Delaware county; Samuel Calvin - 40 
Occurrence of Megalomus canade7isis, Hall, in Le Claire beds at Port Byron, Illinois; 
William Harmon Norton - 42 
Report of the committee on state fauna; C. C. Nutting 43 
Insects; H. F. Wickam 45 
A kymograph and its use; W. S. Windle 61 
Volatility of mercuric chloride; Abbott C. Page 55 
Changes that occur in ripening corn; C. F. Curtiss 56 
Chemical analysis of soils; G. E. Patrick 58 
Nitrogen compounds of the soil; D. B. Bisbee 66 
A chemical study of honey; W. H. Heileman 67 
Effects of heat on the germination of corn and smut; F. C. Stewart 74 
Plant lice infesting grass roots; Herbert Osborn and F. A. Sirrine 78 
Some bred parasitic hymenoptera in the Iowa Agricultural College collection; 
Alice M. Beach 92 
A study of the physical properties of solutions of lithium chloride in amyl alcohol; 
Launcelot W. Andrews and Carl Ende - 95 
Distribution of some weeds in the United States, especially Iva xantMifolia, Lactuca 
scariola, Solanurn carolmeum, and Solanum. rostratum; L. H. Pammel 103 
Structure of the seed coats of polygonaceae; Emma Sirrine 128 
Lichens collected by Dr. C. C. Parry in Wisconsin and Minnesota in 1818; Bruce Fink 137 
Study of glands in the hop tree; Cassie M. Bigelow 138 
Graphic representation of the properties of the elements; T. Proctor Hall 141 
Certain minerals of Webster county, Iowa; Arthur C. Spencer 143 
Pollination of cucurbits; L. H. Pammel and Alice M. Beach - 146 
Psyllidae found at Ames; C. W. Mally - 152 
Cement materials in Iowa; H. H. Lonsdale 172 
Mississippian rocks of central Iowa; H. Foster Bain 174 
Topaz crystals from Thomas mountain, Utah; Arthur J. Jones 175 
Formation of the flint beds of the Burlington limestone; Francis M. Fultz. 177 
Synopsis of American paleozoic echinoids; Charles Rollin Keyes 178 
Geological section of the Y. M. C. A. artesian well at Cedar Rapids, Iowa; William 
Harmon Norton 194 
Upper Carboniferous of southwestern Iowa; E. H. Lonsdale 197 
Diseases of plants at Ames, 1894; L. H. Pammel 201 
Coincidence of present and preglacial drainage system in extreme southeastern 
Iowa; Francis M. Fultz 208 
Extension of the Illinois lobe of the great ice sheet into Iowa; Francis M. Fultz 209 
Glacial markings in southeastern Iowa; Francis M. Fultz 213 
Opinions concerning the age of the Sioux quartzite; Charles Rollin Keyes 218 
