12 



Letters on the Diseases of Plants. 



',, 11.— Photograph designed to show the method of conducting experiments at the Wagga Experi- 

 ment Farm. In this portion of the experiment area each row represents a " plot," and is compared 

 only with the row which stands next to it. These particular rows are prmcipal varieties of 

 wheat, snch as Talavera, Pui-ple Straw, AUora Spring, &c., being compared with each other over a 

 series of years as to relative yield of straw and grain. The stacks iu the distance to the left are 

 various sorts of seed-wheat, each of which of course has to be stacked by itself. The house on 

 the right is a Government farm-employee's cottage. The plots condvicted on the row system extend 

 as far as the other house in the distance, and again about half as far in the other direction, i.e., 

 behind the spectator. For the convenience of the visitors the plots are arranged alongside a road, 

 which leads by both the houses shown in the photograph. Nearly all the landscape in the far 

 distance is composed of wheat paddocks. 



