38 



and the unsprayed lawn. The dandelion blooms were then care- 

 fully counted in each strip. The results are as follows: 



A strip 5 x 100 feet within the sprayed area contained 140 



blooms. 

 A strip 5 x 100 feet within the unsprayed area contained 



1245 blossoms. 



In like manner, a strip ten feet wide and thirty feet long was laid 

 off on the east boundary of the two plats, thus including a five-foot 

 strip of unsprayed lawn and an adjoining five-foot strip of sprayed 

 lawn. The counts of dandelion blooms within were as follows: 



A strip 5 x 30 feet within the sprayed area contained 72 



blooms. 

 A strip 5 x 30 feet within the unsprayed area contained 



628 blooms. 



As regards the effectiveness of the spraying, the above figures 

 show that there were approximately 89 per ct. fewer dandelion 

 blooms in the sprayed area. Apparently, the two or three season's 

 spraying on Plats 3 and 2, respectively, had reduced the number 

 of plants 89 per ct. None of the plants remaining on the sprayed 

 area had as yet produced seeds. 



THE EXPERIMENTS IN 1917. 

 CONDITION OF PLAT 1. 



At the beginning of this season, five years after spraying, there 

 appeared to be fully as many dandelion plants in the sprayed plat 

 as in the adjoining areas, with the exception of the western section 

 of the plat which was treated with manure in 1913. Here, the effect 

 of the manuring had, apparently, been in the direction of causing 

 a vigorous growth of grass which prevented the reappearance of 

 seedling dandelion plants. 



CONDITION OF PLATS 2 AND 3. 



On these two plats there were fewer dandelions than on the ad- 

 joining unsprayed lawn. However, seedling dandelions were 

 appearing in constantly increasing numbers. 



SPRAYING LAWNS WITH A POWER SPRAYER PLAT 4. 



Even tho the work of the previous years with a small outfit on 

 small plats had been comparatively successful, it seemed advisable 



