JtTNE IS, 1909] 



SCIENCE 



981 



Some Parasitic Polyporacew : C. D. Leabn. 



The present paper embodies the results of a 

 field study of the commoner local species of the 

 family. The economic and pathological aspect of 

 Polyportis ignarius, P. fulvus., P. everhartii and 

 Elfvingia megaloma are discussed. 

 An Anatomical Study of the Boots and Rhizomes 



of a Few Weeds: L. H. Pammel and Estelee 



D. FOGEL. 



It is a very common practise in agricultural 

 literature to refer to the rhizomes of quack grass 

 and germander and other ground stems of this 

 kind as roots. The morphology indicates that 

 these are stems beyond a doubt. On the other 

 hand the underground portions of the milkweed, 

 Canada thistle and horse nettle are also referred 

 to as roots by the farmer and correctly so, and yet 

 quite a number of botanists have fallen into the 

 error of calling these structures stems. The com- 

 mon morning glory is a stem. The histological 

 structure shows beyond a doubt that they are true 

 roots. 

 The More Important Factors concerned in the 



Production of Plant Diseases: L. H. Pammel 



and Chaelotte M. King. 



A brief survey and review of the fungus dis- 

 eases occurring upon cultivated plants for twenty- 

 five years in the state of Iowa. Giving dates for 

 the epidemics of rusts and causes leading up to it, 

 also a discussion of the more general problems of 

 plant diseases and their relation to climatic con- 

 ditions. 

 Plant Distribution in Iowa in Relation to Geologic 



Formations: B. Shimek. 

 The Sand-dune Flora of Iowa: B. Shimek. 

 The Flora of Iowa Rock, a Small Rocky Island im 



Puget Sound: Robert B. Wyxie. 

 Notes on Spore Formation in TJlva: Eobeet B. 



Wyue. 

 Slime Moulds of the Yosemite: Thomas H. Mc- 



BBn)E. 



Preliminary report: (1) the locality: (a) alti- 

 tudes, (6) general climatic conditions; (2) the 

 season of collecting, and conditions influenced by 

 altitude; (3) list of species taken, with notes; 

 (4) probable results of further explorations. 

 Okoboji Laboratory: Thomas H. McBKroE. 

 Some Features of Iowa Ground Waters, II.: W. 



S. Hendeixson. 

 The Training of the Technical CJiemist: J. S. 



Staudt. 



This paper and the one following were presented 



before the Iowa Section of the American Chemical 



Society and were read before the academy by 



invitation. 



The Influence of Copious Ingestion of Water: 



Steixa a. Haetzell. 

 A Hysteresis Curve: D. W. Mobehouse and 



Haket Woodbow. 

 The Googler Primary Cell: Haeet Woodeq-w. 

 On the Use of the Balance: LeRot D. Weid. 

 The Fifth and Seventh Cranial Nerves of Pletho- 



don glutinosus: H. W. NoEEis. 



A criticism of a recent paper by Dodds. The 

 supposed anomalies in the fifth nerve of P. glu- 

 tinosus are found to fall into line with the com- 

 mon arrangement in urodele amphibians. 

 The Migration of Nervous Elements into the 



Dorsal and Ventral Nerve-roots of Pig-embryos : 



Albebt Kuntz. 



Embryological evidence is presented to show the 

 fact of migration of nervous elements from the 

 neural tube of the embryo into the dorsal and the 

 ventral nerve-roots. An attempt is made to de- 

 termine the nature of such migrating cells. Gen- 

 eral inferences touching neurological problems. 

 The Unios of the Muscatine Comity Loess: B. 



Shimek. 



The following papers were read by title: 

 The Asteroid, 1906, W. E.: Ellis B. Stauffee. 

 Further Studies of the Eastern Nebraska Flora: 



Chaeles E. Besset. 



Studies are now being made in the department 

 of botany of the University of Nebraska of the 

 plants now and formerly used by the Indians of 

 eastern Nebraska, especially the Omaha tribe. It 

 is found that many species of plants were formerly 

 used that are not now in use, and within the last 

 few years some plants have been brought into use 

 that had not been previously used. It is hoped 

 that a preliminary report can be made by the 

 middle of the year. 

 The Estimation of Arsenic and Cobalt in Smal- 



tite: Nicholas Kniqht. 



The complicated reactions, oxidation of the 

 arsenic with chlorine. The separation of cobalt. 

 The change in the valence of cobalt from two to 

 three. 

 An Analysis of the Fruit of Viburnum nudum: 



Nicholas Knight. 



A continuation of the chemical study of wild 

 fruits from Sylvan Beach, New York. The extrac- 

 tion and determination of the sugars. The organic 

 acids. The extractions of the oils with ether. 



