Mat 31, 1907] 



SCIENCE 



861 



The formation of loess on the Paha by wind 

 is explained largely on the basis of plant 

 ecology. 



(c) The Loess and the Nebraska Man (illus- 

 trated) : B. Shimek. 



A brief discussion of the weakness of the 

 evidence that the human remains found near 

 Plorenee, Nebr., are in undisturbed loess. 



The Orbit of the Asteroid, 1906 W. E.: E. B. 



Stouffek. 



A Catalogue of the Poisonous Plants of Iowa: 

 L. H. Pammel and Estelle D. Eogel. 

 The purpose of the catalogue is to enumer- 

 ate the plants that are poisonous to live stock. 



A Study of the Variation in the Number of 

 Ray Flowers in Certain Oompositw: W. S. 

 Dudgeon. (Presented by L. H. Pammel.) 

 A study was made of the ray flowers of the 

 following plants: Budbechia triloba, B. hirta 

 and Helianthv^ grosseserratus. The constant 

 was worked out according to Professor Daven- 

 port's formula. The ray flowers of B. hirta 

 vary from 2 to 28 out of 3,847 counted; 1,327 

 had 13 rays. The ray flowers of B. triloba 

 vary from 5 to 18. The ray flowers of the 

 sunflower vary from 7 to 25. In B. hirta 

 there appear to be two well-marked forms. 



Iowa Erysiphacece : J. P. Ajsjderson. 



Notes on Iowa Algw: E. E. Buchanan. 



Keys to groups and species of algse and 

 their reported distribution in the state. 

 The Homologies of Tissues in Ferns: H. S. 



CONARD. 



Studies in, EaryoMnesis : J. E. Gow. 



An account is here presented of some obser- 

 vations on the process of cell division in the 

 poUen mother cells of Trillium sessile, in the 

 vegetative cells of the nucellus of Ariscema, 

 and in the young root tips of Zea mays. At- 

 tention is called to the latter as contradicting, 

 apparently, certain accepted theories of vegeta- 

 tive cell divisions. 



(a) The Estimation of Silica; (6) The An- 

 alysis of Some Iowa Waters: Nicholas 

 Knight. 



The Becent Investigation of Iowa Ground 

 Waters: W. S. Hendeickson. 



Some Problems in Municipal Sanitation: L. 



H. Pammel. 



The question of the water supply for cities 

 and villages is a very important one. With 

 the density of population increasing, the prob- 

 lem becomes more complex. All of our Iowa 

 streams are more or less polluted. The paper 

 discusses some of these and the supposed case 

 of pollution when a railroad passes over water. 

 Such pollution will not occur if proper pre- 

 cautions are taken. 

 The Physical Science Laboratory of the State 



Normal School (illustrated) : A. C. Page. 



Description of new laboratory presented be- 

 cause of possible interest to any contemplating 

 building. 

 The Lateral Line System of Amphiuma: H. 



W. Norms. 

 Securing a Stand of Clover on the Southern 



Iowa Loess — A Biological Study: E. B. 



Watson. L. S. Eoss, 



Secretary 



THE AMERICAN PHYSIOLOGICAL SOCIETY 



The seventh special meeting was held ":at 

 Washington, May 7 and 9, in conjunction with 

 the Congress of American Physicians and 

 Surgeons. 



The sessions of the society were held in the 

 Physiological Laboratory of the George Wash- 

 ington University. 



The scientific program was as follows : ' 



TUESDAT, MAY 7 



Yandell Henderson : ' Production of Shock by 

 Loss of Carbon Dioxide and Relief by Partial 

 Asphyxiation.' 



J. A. E. Etsteb: 'Vagus Inhibition from Rise 

 of Pressure in the Aorta.' 



Donald R. Hookee : ' May Reflex Cardiac Ac- 

 celeration occur Independently of the Cardio- 

 inhibitory Center ? ' 



WiT.T.TAM H. Howell : ' The Calcium and Potas- 

 sium Metabolism of the Heart during Inhibition 

 and Acceleration or Augmentation.' 



T. SoLLMANN : ' The Acute Effects of Gastrin 

 and Peritoneal Cauterization and Irritation on 

 the Blood Pressure and Respiration.' 



T. SoLLMANN: 'Perfusion Experiments on Ex- 

 cised Kidneys: Solutions of Electrolytes.' 



Velyien E. Henderson : ' The Teaching of 



