224 
which flourished in the transition period between Paleozic and 
Mesozoic Time, particularly in the southern hemisphere, and may 
yet have its living prototype in the South African genus Stangeria, 
e 
vicinity, in New Jersey and on Long Island, are displayed 
in floor cases Nos. 6 and 7. Methods of preservation, either by 
seme incrustation or carbonization, are shown by numer- 
ous specimens of silicified wood, remains of various kinds from 
the cee of calcareous or silicious springs, and from Quater- 
nary and recent swamp deposits, in wall case No. 5, and in floor 
cases Nos, 11 and 12. A large part of the material in floor case 
No. 12 is designed especially to indicate how our living flora is 
being preserved in our peat bogs and other swamp and pond de- 
posits and gradually converted into lignite, by the slow process 
of natural distillation. 
A view of the north side of the east wing of the museum hall, 
containing floor and wall cases Nos. 1-3, is shown in Fig. 39. 
visitor to obtain a general idea ot the significance of the collec- 
tion and the salient features which it represents, it is also well 
adapted for critical study and research. The plants of any given 
horizon or period may be found in their proper stratigraphic 
position in the cases, in accordance with’ the general arrange- 
ment of the museum, and the specimens from each locality, or 
those collected by any expedition at any one time from an exten- 
sive area or region are grouped together, and whenever possible 
a duplicate copy of the paper in which the specimens are 
described is deposited with them for ready refgrence. Type 
specimens are designated by red stars and others which have been 
with practically every palennotsnices in the world, with the result 
