122 The Canadian Horticulturist. 



The number of eggs laid by a single mother is often from looo to 2,000^ 

 so it is evident how rapidly they will increase if neglected. About July ist they 

 issue forth from the mother shell, and seek the leaves. Just before the fall of 

 the leaf, the majority of them seek the undersides of the smaller branches, and 

 thickly congregate together. It is estimated by Prof. Slingerland that there 

 are 20,000 plum orchards in New York State, harboring millions of these scales. 

 As this scale is a sucking insect, it can only be cured by contact with an insec- 

 ticide, as for example, kerosene emulsion. For some insects the stock^solution 

 is diluted with 20 parts of water, for others with 9, but for this only with 

 4 parts of water. During the summer little can -be done to destroy it, but 

 when the trees are leafless, from November ist to April ist, the spray will be 

 most effective. The work must be done thoroughly, as only those scales will 

 be destroyed which are hit by the emulsion. 



NUMBER OF TREES ON AN ACRE. 



30 feet apart each way 50 ', 10 feet apart each way 4.35 



25 feet apart each way 70 ; 8 feet apart each way. 680 



6 feet apart eacli way . . 1210 



5 feet apart each way 1 746 



4 feet apart e ich way, 2725 



3 feet apart each way 4840 



20 feet apart each way 110 



18 feet apart each way 1.35 



15 feet apart each way 195 



12 feet apart each way 3D0 



Rule. — -Multiply the distance in feet between the rows by the distance the 

 plants are apart in rows and the product will be the number of square feet for 

 each plant or hill : which, divided into the number of feet in an acre (43,560), 

 will give the number of plants or trees to an acre. 



The Value of Trailing" Growths for fences is not appreciated in this 

 country as it should be. In Germany the Virginia Creeper is put to simple and 

 effective use for this purpose in urban public grounds. A light, low fence is 

 made of stakes and connecting wires ; the Virginia Creeper is trained up each 

 stake, and made to form graceful festoons between. Its employment in some 

 such fashion would do good service on a place like the Cambridge Common, 

 for instance, now a bare, unattractive expanse, having a sort of kinship with the 

 New England rustic burying-ground. It is surrounded by a fence composed of 

 unhewn granite posts .with squared rails of wood between. Virginia Creeper,. 

 Japanese Ampelopsis, and perhaps other twining or climbing plants, might con- 

 vert this old fence into a thing of beauty. In public parks the requirement for 

 protection of the borders sometimes necessitates guards of wire and stakes along 

 the paths. These are often great disfigurements, and their offensive aspect, in 

 places where they seem to be required permanently, might be at least mitigated 

 by the use of Virginia Creeper after the German fashion. — Garden and Forest. 



