168 The Principles of Fruit-growing. 
Populus grandidentata var. pendula—May 12th, 244 in.; June 
29th, 17 in. 
Populus monilifera—May 16th, 2 in.; June 19th, 6 in. 
Prunus nana—May 16th, 3 in.; 26th, 5 in.; June Ist, 7 in. 
Prunus Pissardii—May 8th, 5 in.; June 13th 10 in. 
Prunus serotina—May 12th, 7 in.; 30th, 14 in. 
Prunus Virginiana—May 12th, 3 in.; 26th, 6 in. 
Pyrus Aucuparia—May 34, 4% in.; June 6th, 12 in. 
*Pyrus Malus—May 9th, 2 in.; 26th, 8 in. 
Quercus alba—May 12th, 2 in.; 18th, 6 in.; 26th, 13 in. 
*Quercus bicolor—May 9th, 2 in.; July 5th, 12 in. 
Quereus coccinea var. tinctoria—May 12th, 1 in.; June 13th, 
7 in. 
*Quercus ilicifolia—May 14th, 3 in.; June 6th, 13 in. 
*Quercus imbricaria—May 12th, 2 in.; June 6th, 20 in. 
Quercus macrocarpa—May 16th, 4 in.; 20th, 6 ims. oth, 
12 in.; 30th, 13 in.; June 6th, 14 in. 
Quercus nigra—May 12th, 5 in.; June 6th, 14 in. 
Ribes floridum—May 12th, 2 in.; June 6th, 12 in. 
Robinia hispida—May 18th, 2 in.; June 19th, 12 in. 
Robinia Pseudacacia—May 12th, 1 in.; 18th, 2 in.; 26th, 
3 in.; 30th, 4 in.: June 6th, 5 in.; 13th 6 in.; 20th, 7 in.; 
29th, 9 in,; Jnly Cth, 10 in. J 
*Salic Babylonica—May 9th, 4 in.; 12th, 2 /in.; 16th, 3 in.; 
20th, 4 in.; 26th, 6 in.; June Ist, 12 in.; 13th, 16 in.; July 
l1th, 27 in.; 19th, 34 in.; 25th, 40 in.; Aug. 3d, 42 in. 
Syringa vulgaris—May 3d, 4 in.; 9th, 8 in.; 12th, 12 in.; 
18th, 13 in.; 26th, 14 in. 
Tila Americana—May 14th, 2 in.; 18th, 8 in.; 20th, 5 in.; 
26th, 11 in.; June 1, 12 in.; 6th, 13 in. 
Vitis riparia—May 14th, 1 in.; 30th, 15 in. 
8. Tillage should generally be stopped in late sum- 
mer or very early fall. The tree has completed its 
growth. It must now ripen and prepare for winter. 
It can spare some of the moisture which comes with 
