48 



SCIENCE 



[N. S. Vol. XLVI. No. 1176 



way on the rodents of Iowa for the Iowa Geolog- 

 ical Survey. Two forms, Sduriis hudsonicus min- 

 nesota Allen and hepus californicus melanotis 

 Mearns, are for the first time recorded from Iowa 

 and the known distribution of some other species 

 of rodents is extended. A brief survey of the 

 bounty system in the state is also given. 



Botany 

 The Sand- flora of Iowa: B. Shimek. 

 Some additional notes on the pollination of red 



clover: L. H. Pammel and L. A. Kenoter. 

 The germination and juvenile forms of some oaTcs: 



L. H. Pammel and Charlotte M. King. 

 Plant studies in Lyon county, Iowa: T). H. Boot. 

 Notes on Melilotus alba: Walter E. Eogers. 

 The cleistogamy of Heterantliera duhia: E. B. 



"Wylie. 

 The influence of soil management on the formation 



and development of fruit buds: E. S. Kirby. 

 (o) The white waterlily of Clear haTce, Iowa. (6) 



Tree growth in tlie vicinity of Grinnell, Iowa: 



H. S. CONARD. 



A picea from the glacial drift: Wilbur H. 



Thomas. 

 Pioneer plants on a new levee, III.: Frank E. A. 



Thone. 

 The m,orphology of the thallus and cupules of 



Blasia pusilla: Marguerite B. Eoheet. 

 Chlorotic corn: W. H. Davis. 



The cecial stage of alsike clover rust : W. H. Davis. 

 The rusts on clover were formerly classified as 

 one species until Liro proved the rust on white 

 clover (T. repens L.) separate, autoecious and pos- 

 sessing all spore forms. The fecial stage of red 

 clover rust was definitely described by Davis and 

 Johnson at a meeting of the American Association 

 for the Advancement of Science, December, 1916. 

 They showed this rust to be auttecious also, and 

 composed of all spore forms. The disposition of 

 the rust on alsike clover has not been clear; some 

 place it with red clover rust while it is generally 

 regarded as white clover rust. The secial stage has 

 not been reported in the United States, but has 

 been reported in Germany by Rostrup (1888). 

 The correct determination of his host is not gen- 

 erally accepted. 



The use of ferric and ferrous phosphate in nutrient 

 solutions: George- E. Corson and Arthur L. 

 Bakke. 

 A series of experiments have been performed 



using varying amounts of ferrous and ferric phos- 



phate in Shive's solution as a general basis, in the 

 growth of wheat and Canada field pea seedlings. 

 Perrons phosphate can not replace the ferric phos- 

 phate. The amount as used by Shive has been de- 

 termined to be the best for the growth of wheat, 

 but for Canada field pea the iron requirement is 

 evidently higher. 



Chemistry 

 (o) Some natural waters of central New YorTc. 

 (6) Diffusion phenomena of double salts: 

 Nicholas Knight. 

 Water-works laboratories : Jack J. Hinman, Jr. 



A collection of data from ninety water works 

 laboratories in the United States and Canada, 

 safeguarding an average daily supply of 2,800,000,- 

 000 gallons for more than 17,000,000 people. All 

 of these laboratories have been established since 

 1897. Their organization and methods of chemical 

 and bacteriological control are discussed from the 

 technical standpoint. 



Laboratory control is essential to the proper 

 operation of warter-works plants which treat a 

 water of variable character. 



The free energy of dilution of lithium chloride in 

 aqueous and alcoholic solutions by the electro- 

 motive force method: P. S. Mortimer and J. N. 

 Peaece. 



The electrical conductivity and viscosity of solu- 

 tions of silver nitrate in pyridine: H. L. Dunlap 

 AND J. N. Peaece. 



A study of tlie relation between solubility, the heat 

 of solution and the properties of the solvent: H. 

 E. Fowler and J. N. Peaece. 



The partial analyses of some Iowa clays (prelimi- 

 nary report) : J. N. Peahce. 



The protein content and microchemical tests of the 

 seeds of some common Iowa weeds: L. H. Pam- 

 mel AND A. W. Dox. 



(a) Synthesis of a naphthotetrazine from diethyl 

 succinylosuccinate and dicyandiamide. (b) The 

 behavior of benzidin-e toward selenic and telluric 

 acids. (c) Amino a-oids and microorganisms: 

 Arthur W. Dox. 



The separation and gravimetric estimation of po- 

 tassium: S. B. KUZIRIAN. 



The action of the amino group on amyloUtic 

 enzymes: E. W. Eockwood. 



Some of the factors that influence the extraction of 

 gold from ores by the cyanide process: A. W. 

 HissoN. James H. Lees, 



Secretary 



