14 
IOWA ACADEMY OF SCIENCE Voi* XXIX, 1922 
Effect of Hardness of Water on the Fungicidal Value of Mercuric 
Chloride Solutions. J. C. Gilman 347 
Chemistry 
Iowa and Ames Sections American Chemical Society 
A Study of Dolomites from the Austrian Tyrol. Nicholas Knight... 349 
The Role of Organic Chemistry in Plant and Animal Therapy. Henry 
Gilman 
A New Method for the Introduction of an Ethyl Group. Rachel 
Hoyle, John B. Schumaker and Henry Gilman 
A Rapid and Inexpensive Electrolytic Determination of Copper With- 
out the use of Platinum Cathode. Stephen Popoff and T. C. Tucker 
Inexpensive Apparatus for use in Large Classes of Quantitative 
Analysis. Stephen Popoff 
The Electrometric Titration of Tin. Critical Study of the Standardi- 
zation of Solutions for use in Titration of Tin. Stephen Popoff 
and F. L. Chambers 
The Color of Soils as an Indication of Plant Food Content and Fer- 
tility. P. E. Brown 
A Chemical Classification of the Activities of Soil Micro-Organisms. 
Paul Emerson 355 
Water Purification in Iowa. Jack J. Hinman Jr 
The Electrometric Determination of Sulfurous Acid with Perman- 
ganate. W. S. Hendrixson and L. M. Verbeck 361 
The Electrometric Standardization of Titanium Solutions. W. S. 
Hendrixson and L. M. Verbeck 365 
A Note on Lantern Slide Making. E. W. Rockwood 
The Relation of High School Chemistry to College Chemistry. Ed- 
ward Bartow 
A Solubility Survey — (1) An Apparatus for the Determination of 
Solubility up to the Periodic System, P. A. Bond. (2) A Cross 
Section of the Periodic System — Solubilities in Sulphur Dioxide. 
M. C. Waddell with P. A. Bond 
Diacyl Derivatives of Ortho Aminonaphthols. L. Charles Raiford and 
K. C. Armstrong 
Alkyl Sulfates — (1) Studies on the Equilibrium between Alcohols 
and Sulphuric Acid, and the Sulfates and Water. Harry F. Lewis. 
(2) The Relative Hydrolysis of the Sulfates by Water and Acids. 
H. F. Lewis and O’Neal Mason. (3) The Influence of Molecular 
Weights on the Hydrolysis. H. F. Lewis and Arthur Damerow... 
The Colorimetric Determination of Hardness in Water. H. F. Lewis 
and Arthur Damerow , 
The Electrometric Titration of Organic Acids. J. H. Buchanan and 
C. J. Meister 
The Effect of the Introduction of Steam into Stop End Retorts in the 
Manufacture of Coal Gas. George W. Burke 
Studies on Yeast IV. On the Presence of the Antineuritic and the 
Growth Promoting Vitamines in Yeast Grown in a Synthetic Medium. 
V. E. Nelson, E. I. Fulmer and V. G. Heller 
