INTRODUCTION


 The problem of utilizing cull citrus fruits has been discussed
and studied for many years. A large amount of investigational
work has been carried on by the U. S. Department of Agricul-
ture, by private and public enterprises in California, and, to a
greater or lesser extent, in Florida. A great many attempts
have been made to utilize cull fruits; some of them have been
successful. In October, 1911, arrangements were made with the
Mellon Institute, in cooperation with the Florida Citrus Ex-
change, whereby Mr. F. A. McDermott received the appointment
to a fellowship to work on the problem of utilizing cull citrus
fruits. Mr. McDermott continued his studies until August,
1913. At the close of his work he wrote up the results of his
investigation in an extended thesis. This was i,.:i_-.,I to the
Florida Experiment Station for publication in March, 1916.
Owing to the length of the thesis it seemed impracticable to
publish it in the original form. In the fall of 1916, Mr. S. S.
Walker, Associate Chemist to the Experiment Station. was au-
thorized to prepare a manuscript from the original thesis. This
has been submitted tq Mr. McDermott, who consents to its
publication in this form.
 Since the preparation of this manuscript, Mr. Walker has
resigned his position as Associate Chemist, to take up work
with a private enterprise in the utilization of citrus by-products.
The thanks of the institution, and of the citrus-growing people
of the State are due Mr. McDermott for this excellent piece of
work, and Mr. Walker for preparing it in form for publication.
 P. H. ROLFS,
 Director.