182 
As New York was totally destitute of materials for my 
work, I found it necessary to commence the inspection of the 
Museums of the other cities. I examined the Natural 
History collections at Boston, Washington and Chicago, but 
it was not until I reached Philadelphia that I discovered any 
materials available for my immediate purpose. There I 
found some treasures in the way of fossils, and obtained the 
permission (freely granted) of the Trustees of the Academy 
of Natural Sciences, to have their fossils moulded, on condi- 
tion that I should give them duplicate moulds of the principal 
examples; in this way I was enabled to secure to the Com- 
missioners of Central Park, the complete skeleton (with my 
restoration of the missing parts made at Philadelphia) of the 
gigantic Hadrosaurus described by Dr. Leidy. I afterwards 
had the pleasure of presenting to the Academy of Sciences 
(at my own expense) an entire restoration of the skeleton, 
combining the actual fossil remains of the limbs of that 
extinct giant, which I erected in their Museum, and presented 
to the trustees on the 21st November, 1868, and I now hand 
to you the resolutions of the representative council of that 
scientific body, by which the President and Trustees recog- 
nized the accuracy and value of my work and mode of 
teaching. 
I returned to New York to commence my actual work in 
the Park on the 4th December, and took possession, on 7th 
December, of the upper floor of the Arsenal building as a 
temporary studio. My impatient desire to get to work, 
struggled with the difficulties and apparent unfitness of the 
place; the upper floor of an old building required some 
caution where to place a model in wet clay weighing several 
tons; by the 18th March, 1869, the eighth month of my em- 
ployment by the Commissioners, I had realized the blocking 
out of the rehabilitated form of Hadrosaurus in a recumbent 
position, in submission to the necessities of a low roof under 
which the Hadrosaurus could not have assumed the walking 
attitude. The illustration in the 12th Report, contains a true 
picture of my studio at the Arsenal in the month of June, 69, 
the large model then nearly completed was afterwards 
