H. E. ANNETT. 335 



When, following a cold night a large yield of juice is obtained, 

 there is an accompanying decrease in sugar concentration. As a con- 

 sequence of this we see from the charts that whereas the curve for 

 yield throughout the season is concave with regard to the base line 

 of the chart, the curve for sugar content of the juice is convex. In 

 other words, at the beginning and end of the season we have the 

 lowest yields of juice, but at these times it is most concentrated. 



In the middle of the season with the highest yields of juice 

 we have the lowest concentrations of sugar. 



The ' tekat ' curves of trees Nos. 3 and 20 and the dokat curves 

 of No. 11 are particularly good illustrations of this connection between 

 yield of juice and its sugar concentration. Further it is to be noted 

 that tekat. juice is richer than jiran or dokat in sugar, but that its yield 

 is much smaller. 



(c) Cloudy, rainy or misty weather. These weather conditions 

 always affect the yield adversely. This is probably due to the fact 

 that in these kinds of weather the night temperature is relatively high, 

 but of course the high humidity might also have an effect in stopping 

 bleeding. From the 12th to the 15th of January and the 31st of 

 January to 8th February the weather was cloudy. From the charts 

 it is seen that these dates correspond to rises in the night temperature. 



Jiran versus dokat and tekat juices. It is well recognised that 

 dokat juice is much less in quantity than the corresponding jiran. 

 The yield from tekat juice is much less still. The curves shew up these 

 points very well. Towards the end of the season, however, the yield of 

 dokat juice is frequently seen to surpass the jiran yields. (See charts 

 for trees Nos. 3, 11 and 20.) This is explained by the fact that it is a 

 common practice towards the end of the season to cut the tree both 

 for jiran and dokat. Dokat juice obtained from a freshly cut surface 

 is called dokat-pocha. 



With regard to the amount of sugar in the juice dokat is supposed 

 to be worse than jiran and tekat, much worse than either of these. 

 Here it is perhaps in place to observe that a high yielding tree need not 

 necessarily give a juice poor in sugar. High yield of juice, rich in 



