PART III. 
The following, in brief, is an outline of the work to be under- 
taken, if all goes well : — 
1. Meteorological observations and recording of same. 
2. Growing in observation lines of some seventy varieties of 
Cotton, which, so far as is known, have not been grown in Southern 
Rhodesia previously: (a) On unmanured land; and (b) on heavily 
manured land, with the object of discovering a variety or selection 
from a variety which wil give a dwarf or medium sized plant, when 
grown in rich soil. 
3. Growing in observation lines of field selections made last 
season under conditions (a) and (b), as indicated above. 
4. Recording, usual observations and measurements on 
selected plants of each variety and strain, grown on the Station. 
5. A repetition of the variety trials conducted last year, with a 
view to ascertaining to what extent such trials can be relied upon. 
6. A companson of Cotton plants grown—(a) in the insect proof 
cage, with (b) Cotton plants of the same variety grown under field 
conditions. 
7. Observation rows from seed of the different varieties, grown 
under cage conditions last year, with a view to noting whether or not 
any crossing has taken place. 
8. * Increase ” or *‘ small bulk >’ plots of what appears to be 
the better varieties among those which were grown in last year’s 
variety trials. The results of these trials are not yet to hand, nor is 
it likely that they will give any indications when they arrive, but 
three out of the five varieties appeared to be much better than 
Improved Bancroft. 
V. Uganpa. 
Aims. 
At the present time breeding and selection is being done with the 
following aims: — 
Improvement of yield. 
Purity of strain. 
Maintenance of a regular 1 8-16in. staple. 
Maintenance of quality. 
Resistance to Black arm disease. 
Selection. 
Single plants are selected from the growing crop in native plots 
and from progeny rows of the previous year. From these plants 
progeny rows are grown and 15 plants in each row are very carefully 
observed. the following records being taken: — 
Daily flowering records. 
5 day boll records. 
Weekly growth measurements. 
All plants are self fertilised by the tying method. 
121