HORTIOULTUKAL DIVISION. 459 



but by the middle of September the ground was covered tbickiy. 

 Frost came October first, but the vetch was not injured and it 

 continued to grow until the middle of the month, and remained 

 green still longer. It made a remarkable cover, growing Ituee- 

 high in a dense mat and everywhere completely covering the 

 ground. It began to flower in September, but no seeds ripened 

 except upon a few poor spots. Upon light soils, seeds would 

 probably form freely, but the plant is an annual and is not likely 

 to become a weed. The roots do not extend deep. With the 

 approach of hard, freezing weather, the stalks fell upon the 

 ground, where they now lie like a thin even covering of old hay. 

 The stems are soft and can be easily plowed under in spring and 

 will soon decompose; and they will not keep the soil wet too late 

 in spring, which is an important point upon clay soils. On the 

 whole, we are much pleased with the vetch as an orchard planr, 

 and shall use it again. 



Samples of this vetch, including four to six inches of the roots, 

 gave the following fertilizer analysis: 



Nitrogen, original substance, .65 per cent; dry substance, 

 3.10 per cent. 



Phosphoric acid (P2 05), original substance, .146 per cent; 

 diy substance, .70 per cent. 



Potash (K2 O), original substance, .475 per cent; dry substance, 

 2.28 per cent. 



Water, original substance, 79.15 per cent. 



Compared with clover, the fertilizer value is high. The follow- 

 ing are summaries of several analyses of red clover: 



Nitrogen, dry substance, 2.05 per cent. 



Phosphoric acid, dry substance, .66 per cent. 



Potash, dry substance, 2.24 per cent. 



SUBSTITUTES FOR GLASS IN GREENHOUSE ROOFS. 



There is much inquiry for some cheap substitute for glass for 

 greenhouses, and various preservative preparations are recom- 

 mended for the treatment of cloth and paper to be used in roofing. 

 We have tried paper one season and cloth two seasons, and find 



