before it was burned. Prof. Trelease loaned me all the Missouri 

 Botanic Garden Astragali. 1 have gone over all the material of the 

 Gray Herbarium and photographed all the types through the kindness 

 of Dr. Robinson. I examined the types of the Philadelphia Academv 

 of Science by permission of Thomas Meehan; of Columbia College 

 through Prof. Underwood. While at Washington I worked up all the 

 material of the National Herbarium, and since then have received 

 much material from Dr. Rose and Mr. Maxon. I have been in constant 

 correspondence with Mr. S. B. Parish through the years and have re- 

 ceived critical material from him. The same is true of W. C. Cusick. 

 To Prof. Beattie 1 am indebted for an investigation of the Washing- 

 ion material. To Prof. Hall of the University of California for their 

 material, to F. H. Hillman for Nevada material, to the Agricultural 

 College of Montana and the State University collections, to A. Nelson 

 for a few. specimens of Wyo'ning Astragali, to Mr. Osterhout of Colo- 

 rado for material, to Mr. Ruth of Texas, to the University of Colorado 

 for material, to Prof. Thornber of the University of Arizona, to 

 Prof. Wooton of New Mexico, to Mrs. R. M.Austin and Mrs. Clemen? 

 for all her material, and to many others I am indebted. My fi'ieno 

 I. E. Diehl has gone over much of the MS. and checked it up witl 

 herbarium material catching up occasional slips. The drawing^ 

 are the work of Miss Clara Brooks for the most part. A few have beet 

 made by my daughter Mildred and a few by myself, particularly 

 cross sections of fresh material. All drawings are natural size 

 unless otherwise stated. Most of the cross sections of fresh material 

 were preserved in formaline infiltrated with celloidin and stained 

 on the slide with picro-carmlne, dehydrated with various alcohols 

 and xylol and mounted in Canada halsam. 



