252 SHADE-TREES IN TOWNS AND CITIES 



While the average distance at which certain species are 

 to be planted may be prescribed, the actual spot where the 

 individual specimens are to go cannot be determined from 

 the maps, unless every street obstruction were carefully 

 noted and its position indicated on the map. Such work 

 would entail a great deal of useless labor, for on the aver- 

 age street there are many lamp-posts, fire-hydrants, cross- 

 walks, and water, sewer, and gas connections that are to be 

 avoided. The writer has found from experience that it is 

 better to decide the exact spot where new trees are to be 

 planted while in the field. It usually becomes necessary in 

 many individual instances to increase or diminish the aver- 

 age prescribed distance in order to keep away from points 

 where trees cannot be planted. 



After the places for new trees have been marked, their dis- 

 tances apart should be noted in the field book, using a small 

 cross for each tree as shown in the specimen pages. Usu- 

 ally one species is used on a street, and therefore it is not 

 necessary to mark every tree as in the case of existing trees. 

 One record of the species and the date planted may be made 

 in the field book on the first page of the street. A similar 

 record should be entered on the finished office maps. 



RECORDS OF NEW TREES 



The newly planted trees are plotted on the same maps as 

 the old trees, and are indicated by red circles. These trees 

 are numbered with a new series of numbers, beginning with 

 number 1 ; but in order not to confuse the new trees with 

 the existing trees a zero "0" is prefixed to the numeral. 

 The beginning of the trees on each street with number "1," 

 or number "01," eliminates the use of large numbers. 

 Each tree is absolutely fixed by the designation of the street 



