ENCLOSURE TO PART III. )
this latter being the altitude of the main area for cotton in Nyasaland.
The climates of these two stations differed greatly ss regards heat
intensity and he expected to find some difference in the correlated
results. So far he had oniy had experience during one season and
that at one station; the work was really only just being started. The
observations taken were the growth of the plant from the ground,
measured weekly; its flowering, measured daily; losses attributed to
pests, measured daily; boil weight, etc. He was endeavouring to plot
the results in curves.
So far he had seen no natural shedding. Losses were due in the
main to boll worm; in Nyasaland other forms of shedding were
entirely obscured by that due to boil worm. His boll worm records
were at present incomplete, but he hoped to carry out further
observations during next year. He considered on present evidence
there was a seasonal distribution of boll worm species in Nyasaland,
although previous observations had been against this view. Tobacco
was a host of American boll worm in Nyasaland. Natives found boll
worm attack to be negligible between August and October and they
were altering their planting date accordingly.
A complication in Nyasaland was the attack of the American boll
worm, following that of the Sudan boll worm. Isolated records were
of very little use unless combined with agricultural records. It
appeared to him necessary that correlation should start with the layout
 of experimental stations and that plant development, agricultural,
entomological, and meteorological records should all be got together
on the same basis. For the present season he was working out his
records on seven day means.
THE CHAIRMAN (Mr. Milligan) remarked on the difficulty of
getting information of real value regarding the rainfall; totals and
averages were of course always available, but the more important
details were wanting.
Mr. PARNELL considered that the records of maximum and
minimum temperatures were not of such value as might be expected,
owing to the rapidity with which temperatures changed. = What
would be really valuable would be a thermograph record from which
could be seen the amount of time during which the temperature was
above or below a certain point.
At this point the class of instruments required for records was
discussed and the various members of the Section expressed their
views on the types they themselves were using.
Mr. PEREIRA said that at the present stage there were not many
well equipped stations in Portuguese East Africa.
Mr. CAMERON considered that wind records correlated with
rainfall would be valuable, anyhow in South Rhodesia, although he
agreed that wind records in many countries would probably not be of
much value.
As regards the question of records in the field, the Section
desired to emphasise the importance of correlating plant records and
meteorological data and considered it desirable to draw up a statement
showing the minimum requirements in instruments for individual
stations.
Messrs. Ducker and Nye were asked to draw up a list of : —
(a) .The minimum requirements for a cotton station.
(b) Additional useful apparatus.

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