Shuler and Mr. John Shuler. We are indebted to these 
friends who together have sent to the Botanical Museum 
literally tons of coal balls. We wish to acknowledge also 
the assistance and genuine interest of Mr. Charles Ben- 
dixon, Mr. Frank Markum, and Mr. Joe Johnson. Doctor 
Charles Keyes and Doctor A. K. Miller have kindly 
furnished data on the stratigraphy of the deposits. 
The work involved in sawing and grinding the nod¬ 
ules and in the preparation of peels and microscopic slides 
has been made possible in part by a liberal grant from the 
Milton Fund of Harvard University, and in part by 
gifts from Mr. Thompson. The Trustees of the Eliza¬ 
beth Thompson Fund have installed grinding equipment 
which has been used for the past four years. To all of 
these we acknowledge our gratitude. A word of recogni¬ 
tion is due to the ten students who have cheerfully la¬ 
bored to prepare the thousands of slides now available for 
