the Egyptian Cotton-plant, 123 
where a is the final number of flowers eventually obtained, x is the number 
of flowers up to time t, k and K are constants where 
K — ak log e — 0-4343 ak, 
and L is the time when x = - • 
1 3 
Fig. 3. Flowering curves of Cotton from dates of sowing experiment, Bahtim, 1920. 
VI, Pilion sown March 1. VII, Pilion sown April 1. VIII, Sakellaridis sown March 1. IX, Sakel- 
laridis sown April 1. 
The origin of the time scale can be taken at any point, but usually the 
date of the first flower is taken and the time counted in days from this 
point. t x fixes the position of the curve as a whole along the time scale. 
