228 
1. Masonry, concrete, drainage and water-supply: Joseph 
Havender, Woodlawn, New York. 
The contractor was required to use building stone of high 
quality obtained in the course of grading operations, including 
the removal of a large ledge of rock which stood between the 
building site and the Bronx Boulevard, within two hundred 
feet of the work. The excavations also supplied a large quantity 
of high-quality building sand. 
2. Heating, including installation of an additional 150 horse- 
power steam boiler in the power house: The Johnston Heat- 
ing Company, New York. 
3. Superstructures: The King Construction Company, North 
Tonawanda, New York. 
The three contracting firms worked well together; there were 
occasional delays in adjusting the progress of masonry and 
concrete to other elements of the work, but these were overcome 
by persuasion. More extensive delays were encountered in 
the delivery of building material for the superstructure caused by 
war conditions, and the contract time had to be repeatedly ex- 
tended. The contracts were all finally completed and the work 
accepted in July, 1919, leaving interior grading, benching and 
planting to be done. 
During the Spring Inspection of Grounds, Building and Collec- 
tions on May, 1919, members of the Garden and guests visited 
the new greenhouses, and bronze tablets, commemorating the 
gifts of the Messrs. Guggenheim were unveiled.* 
During the autumn months of 1919, nearly all interior work 
contemplated was accomplished and plants were moved into the 
Central Display Greenhouse during the latter part of October 
and the first part of November and arranged under the direction 
of George V. Nash, head gardner and H. W. Becker, foreman 
gardner. This structure was opened to the public on the after- 
noon of Noveniber 8, with appropriate ceremonies, including 
addresses by Dr. W. Gilman Thompson, president of the Garden, 
by Dr. D. T. MacDougal, director of botanical research, Car- 
negie Institution of Washington, and by Dr. N. L. Britton, 
* Journal 20: 114-115. 
