The basis of the writer's work is included in The Potato.
In several directions further investigations have been made,
those for 1927 being presented in the Supplement.
Newer work done during 1928-29 is reported briefly in the
Previous observations, recorded in Chapters IV., VI., VII.,
and VIII. of The Potato, have been systematically checked for
old varieties and extended to include the many new varieties
which are coming on to the market. Several new characters
which promised to be useful in the discrimination of varieties
were subjected to a critical study in the field; and records
were made of other characters which are significant, though, in
some instances, less useful for field work.
The procedure adopted throughout 1928 was that outlined on
pages 4, 5 and 6 of the Supplement, but in order to secure
greater accuracy all observations were verified during the summer
months by the writer and also independently by his assistant.
A detailed and comprehensive discussion of the observations
made is considered unnecessary as the majority of them
will most probably be published in due course by the Department
of Agriculture for Scotland in Miscellaneous Publications, No. 3.
special attention will be directed, however, to such
characters as have not yet been reported in published papers