— 119 — applied to the land increased, though there were signs of a maximum yield having been reached. On the other hand, the maturing of the cotton was delayed by increase of the water appUed."* The general arrangement of the experiment carried out at the Central Eesearch Farm during the season 1914-15 was as follows :—A series of nine adjacent plots was divided into three sets watered every ten, fifteen and twenty days respectively. Individual plots were then given either 500, 400 or 300 cubic metres of water, so that each set comprised three feddans watered on the same date, but receiving a decreasing supply, i.e. -.r— 1st Set 2nd Set 3rd Set 500 cubic metres every 10 days.

400 300 „ 500 cubic metres every 400 „ 300 „ 500 cubic metres every 400 „ 300 15 davs.

20 days.

The amount of water was regulated by means of the Gibb's Module described elsewhere.

Effect of Irrigation on Flowering.—From the flowering curves for the season 1914-15 it is deduced that : (a) The amount of flowering decreases with an increasing amount of water.

(6) A distinct retardation in the formation of flowers occurs with an increasing supply of water even in the individual plots of the three sets.

(c) That the earliest formation of flowers occurs in the plots which have received the lightest watering.

An even more striking result was obtained in 1913-14 when the observations were carried a stage further back and the formation of buds was recorded.

The effect of this retardation and diminution in the formation of flowers was of course apparent when the boUs began to open. Details of the picking will be given later, but it may be mentioned here that the first picking was * " The Effect of Water on the Cultivation of Cotton." Survey Department Paper No. 31, Cairo, 1913.