75 
HALLS 73, 74 AND 75. 
HALL 73. — Palaeontological laboratory of the Department 
of Geology. 
HALL 74. — Office and library of the Department of Geol- 
ogy. The works in the library treat of geology and kindred 
subjects, and are intended primarily for the use of officers 
of the Department. On application to the Curator, however, 
opportunity will be given to visitors to consult any special 
work. 
HALL 75. — Chemical and Petrographical laboratory of the 
Department of Geology. 
DEPARTMENT 
OF 
BOTANY AND PLANT ECONOniCS. 
This department occupies the galleries of the North, Souths 
East (in part) and West Courts of the main building, and may 
be reached by any of the four flights of stairs near the central 
rotunda, or by the stairways at either side of the east and west 
main doors. 
The department is now being reinstalled. The old geo* 
graphic arrangement, established in the beginning, is being re- 
placed as rapidly as possible by a consecutive systematic series^ 
New cases are being constructed and installed ready to shift 
into their natural places so soon as a sufficient number are com- 
plete. The following elements for the new arrangement will 
be found upon the transept galleries surrounding the central 
dome of the building. 
THE EAST TRANSEPT. 
THE LINACEAE. 
Seven cases devoted to flax, (Linum usitatissimum) , and 
the various utilizations of both its fiber and seed in the manu- 
facture of linen cloth, thread and paper, and linseed oil and 
oil-cake. 
