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crop grown under identical conditions failed to show more than l6 

 per cent, of starch. As a rule the small tubers were found to 

 contain less starch than the larger ones. 



The richer the seed potatoes in starch, the higher the average 

 starch content of the resulting crop. 



Very great progress and development has been achieved in the 

 production of potatoes suitable for starch production by selection 

 and the raising of seedlings from selected parents. 



The starch content of the cultivated potato has been raised quite 

 40 per c&nt. over that of the old standard by this means and 

 varieties of high agricultural productivity and vigour have been 

 placed at the disposal of the growers. 



The period of growth of the German potato crop is about five 

 months, and as it reiuires a considerable amount of plant food in 

 this short space of time the soil must be in high condition and a 

 liberal manuring must be maintained to secure good crops. 



The value of a potato does not depend upon its content of starch 

 alone: the skin, the "eyes," the fibre and especially the structure 

 of the starch granules are of the highest importance from the point 

 of view of the starch manufacturer. 



Compositon of Tubers. 



A careful study of the potato has shown that it is highly im- 

 portant for the starch factory to secure ripe tubers since these give 

 the largest yield of first quality starch. 



The potato crop is liable to various fungoid diseases of the most 

 serious character and the cultivator has to take full precautions 

 against disease. 



In certain seasons the losses from disease are very great. 



The cassava crop as grown in Jamaica should have a great 

 advantage in its immunity from serious diseases and pests and the 

 unrestricted season of growth and harvest. 



* A verage of '.'>S varieties "f Gorman Potatos by Morten, 

 t Average of 21 varieties of Jamaican Cassava by Cousins. 



