PAGF. 



The improvement of medicinal plants, by F. A. Miller 115 



The structure and diagnostic value of the starch grain, by R. B. Harvey. . 121 



Butter fat and butter fat constants, by George Spitzer 127 



Nascent state of the elements, by J. H. Ransom and R. A. Stevens 139 



The penetration of wood, by Zinc chloride, by Edward G. Mahin 149 



A biometric study of the Streptococci from milk and from the iiuman 



throat, by C. AI. Milliard 155 



On the atomic structure of energy, by A. E. Caswell 157 



Notes on the system of crystallization and proper cutting of the sjmthetic 



corundum gems, by Frank B. Wade 169 



On linear difference equations of the first order with rational coefficients, 



by Thomas E. Mason 181 



A note on the intersection of osculating planes to the twisted cubic curve, 



by A. M. Kenyon 189 



Wubush studies, by Charles R. Dryer 199 



I. Terraces of the Wabash Valley in Parke, Vermillion and Vigo 

 counties 199 



II The Raccoon Valley, Parke County, Indiana 206 



III A natural bridge in Parke County, Indiana 212 



The determination of hydrogen, nitrogen and methane in gas by combus- 

 tion in a (juarlz tube, by Frank C. Mathers and Ira Lee 215 



New methods for the preparation of salts of selinic acid, by Frank C. 



Mathers and J. Otto Frank 221 



A new method for tlic ((ualitative detection of clilorides in the [)resence 



of bromides and iodides, by Frank C. Mathers and Ira E. Lee 225 



