HORTICULTUEE AND LANDSCAPE GARDENING. 127 



Philadelphus coronarius — May 12th, 3 in.; June 19th, 19 in. 

 Platanus occidentalis—Ma,y 26th, 1 in. ; July 5th, 9 in. 



* Platanus orientalis~Maj 18th, 3 in.; 20th, 4 in.; 26th, 8 in.; June 1st, 12 in.; 6th, 16 

 in.; 13th, 24 in.; 29th, 40 in.; July 11th, 44 in.; 25th, 52 in.; Aug. 3d, 56 in., still growing. 

 * Populus alba rar. Bolleana — May 12th, 2 in.; Aug. 3d, 32 in. 

 Populus grandidentata var. pendula — May 12th, 2^ in.; June 29th, 17 in. 

 Populus vionilifera — May 16th, 2 in.; June 19th, 6 in. 

 Prunus nana — May 16th, 3 in.; 26th, 5 in.; June 1st, 7 in. 

 Prunus Pissardi—Maj 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 3d, J in. ; June 6th, 12 in. 



* Pyrus Alalus— 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. 



Quercus 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—Maj 16th, 4 in.; 20th, 6 in.; 25th, 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. 



Robtnia Pseudacacia — May 12th, 1 in.; 18th, 2 in.; 26th, 3 in.; 80th, 4 in.; June 6th, 

 5 in. ; 13th, 6 in. ; 20th, 7 in. ; 29th, 9 in. ; July 5th, 10 in. 



* Salix Babyloniea hort. annularis — May 18th, 1 in.; July 25th, 20 in. 



*Salix Babyloniea— May 9th, i in.; 12th, 2 in.; 16th, 3 in.; 20th, 4 in.; 26th, 6 in.; 

 June Ist, 12 in.; 13th, 16 in.; July 11th, 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. 



Tilia Americana— May 14th, 2 in.; 18th, 3 in.; 20th, 5 in.; 26th, 11 in.; June 1, 12 in.; 

 6th, 13 in. 



Vitis riparia— May 14th, 1 in.; 30th, 15 in. 



Vn. Influence of certain Chemicals Upon Germination. — Germi- 

 nation is attended by an evolution of carbonic acid gas, the product of the 

 decomposition of certain ingredients in the seed. If this evolution of gas can 

 be hastened in any manner germination must be hastened. Quick lime, which 

 has a strong aflSnity for carbonic acid itself, has been used for the purpose of 

 hastening germination; its chemical action upon the seed is not understood, 

 however. Certain other substances which have the ability to decompose water, 

 thereby setting free oxygen which unites with the carbonof the seed and passes 

 off with it in the form of carbonic acid, have also been used with varying suc- 

 cess. "A weak solution of alkali quickens the growth of some seeds, and lime- 

 water has been recommended as a steep for cereal, coniferous, and other seeds; 

 but it must be used in a weak state. The secret of success in using lime would 

 seem to be its aflBnity for carbonic acid which it extracts from the seed, and 



