CULTURE OF FARM CROPS. 



to examine the habit of growth of the wheat plants in the 

 spring, which bring about a renewed action of the growth 

 of the winter-sown wheat. Many of the older fibres die 

 during the winter, but on the return of more genial wea- 

 ther new buds are produced, new roots being pushed into 

 the soil, and new fibres and fibrils are produced from these. 

 When the central axis of the plant has by these means 

 been developed or elongated sufficiently, tillering of the 

 plant ceases, and the whole of its strength is devoted to 

 supply the upper part with its leaves and stems. These 

 latter vary, in number, according to the value of the plant, 

 from five to twenty, and produce the ears of grain, which all 

 ripen nearly at the same time. Such is the habit of growth 

 of winter-sown wheat. Professor Buckman next proceeds 

 to show the difference between it and that sown in spring. 

 4. Winter and Spring Wheat. As stated in Part First, 

 par. 3, p. 5, winter and spring wheat are not specially dis- 

 tinct ; and that it is easy to give a winter wheat the char- 

 acteristics of a spring one, and vice versa. Professor Buck- 

 man gives the following table, showing the results of some 

 experiments upon different varieties of wheat, bearing upon 

 this point : 



TABLE OF THE GROWTH OF WHEAT IN EACH MONTH OF THE YEAR. 



