'complete' fertilizer.

"Experiments with the use of raw rock phosphate have been conducted
by the State Agricultural Experiment Stations over periods of twelve
years in Maryland, eleven years in Rhode Island, twenty-one years
(in two series) in Massachusetts, fourteen years (in two series) in
Maine, twelve years in Pennsylvania, thirteen years in Ohio, four
years in Indiana, and from four to six years on a dozen different
experiment fields in different parts of Illinois.

"I have here some quotations taken from the directors of several of
these experiment stations which fairly represent the opinions which
they have expressed concerning their own investigations. Thus the
Maryland director says:

"'The results obtained with the insoluble phosphates has cost
usually less than one-half as much as that with the soluble
phosphates. Insoluble South Carolina phosphate rock produced a
higher total average yield than dissolved South Carolina rock.'

"The Rhode Island director comments as follows:

"' With the pea, oat, summer squash, crimson clover, Japanese
millet, golden millet, white podded Adzuka bean, soy bean, and
potato, raw phosphate gave very good results; but with the flat
turnip, table beet, and cabbage it was relatively very inefficient.'

"The following statement is from the Massachusetts director:

"'It is possible to produce profitable crops of most kinds by