2 
before it was burned. Prof. Trelease loaned me all the Missouri 
Botanie Garden Astragali. I 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 Academy 
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 I am indebted for an investigation of the Washing: 
ton material. To Prof, Hall of the University of California for their 
material, to F. H. Hillman for Nevada material, to the Agricultura! 
College of Montana and the State University colleetions, to A. Nelson 
for a few specimens of Wyoming 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. Clemens 
for all her material, and to many others I am indebted. My friend 
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 beer 
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-carmine, dehydrated with various alcohols 
and xylol and mounted in Canada balsam. 
