94 The American Naturalist [January, 



The Flora of Mt. Orizaba H. E. Seaton 



An apparatus for determining the periodicity of Root Pres- 

 sure M. B. Thomas 



Condensation of Acetophenone with Ketols, by means of dilute 



Potassium Cyanide Alex. Smith 



Condensation of Acetone with Benzoin, by means of dilute 



Potassium Cyanide Alex. Smith 



Pyrone and Pyridone derivatives from Benzoyl-acetone Alex. Smith 



Carbonic Acid in the Urine T. C. Van Nuys andR.E. Lyons 



Results of Estimations of Chlorine in Mineral Waters, by 



Volhardt's Method Sherman Davis 



The Sugar Beet in Indiana H. A. Huston 



Forms of Nitrogen for Wheat H. A. Huston 



A Copper Ammonium Oxide P. S. Baker 



Di-benzyl carbinamine W. A.Noyes 



The Character of Well Waters in a thickly populated area, W. A. Noyes 

 Laboratory and Field Work on the Phosphate of Alumina, 



H. A. Huston 



Recent Archaeological discoveries in southern Ohio, 



Warren K.Moorehead 



Photographing certain natural objects without a camera, 



W. A. Kellerman 



Recent methods for the determination of Phosphoric Acid, 



H.A.Huston 



The digestibility of the Pentose Carbohydrates, By title 



The action of Phenyl-lmlrazin on Furfurol, By title W. E. Stone 



A Graphical Solution for Equations of Higher Degree, for 



both Real and Imaginary Roots A. S. Hathaway 



On some Theorems of Integrations in Quaternions A. S. Hathaway 



The Section of the Anchor Ring W. V.Brown 



A note on the Early History of ^Potential Functions, A. S. Hathaway 



Some Geometrical Propositions C. A. Waldo 



Some suggested changes in Notation R- L- Green 



An adjustment for the Control Magnet on a Mirror Galva- 

 nometer J. P. Naylor 



A combined Wheatstone's Bridge and Potentiometer J. P. Na ) rlor 



Hysteresis Curves for Mitis and other cast iron, J. E. Moore 



and E. M. Tingley 



Heating of a Dielectric in a Condenser. Preliminary note 



Albert P. Carman 



