386 DISEASE IN WILD MAMMALS AND BIRDS 
oratory staff, most of them by one person, and by the 
same technique. All brains were weighed immediately 
upon removal from the body, no preservative being near 
the organ. The brains were themselves externally nor- 
mal. Our technician is skillful in removing the organ, 
practically always getting the pituitary body, and cutting 
off the brain stem at the foramen magnum, the pia 
remaining but the dura removed. Because the speci- 
mens were taken, in practically all cases, from animals 
that died in the Park, and because of the shortness of the 
list (196), it seems wise not to attempt conclusions refer- 
able to comparative weights of the different orders and 
families. However, the data seem worthy of record 
because it is doubtful if anywhere one can find so many 
weights taken under comparable conditions by the same 
personnel. One can find a considerable list of brain 
weights and values in many publications throughout the 
literature, notably in an article by Ziehen in Bardeleben's 
Handbuch der Anatomie (Vol. IV, Abt. Ill 363), but from 
no single source are there so many varieties or so long a 
list. Ziehen's tables are compiled from the literature 
and therefore represent data collected under different 
conditions, many of which were probably pathological. 
The appended figures are to be considered as raw 
material collected mider uniform conditions. 
Examination of the figures bears out in a measure 
some of the remarks made by Ziehen, notably those 
which indicate that between large and small varieties 
of the same general group, the smaller has the greater 
brain weight value and that the youthful animal has more 
brain than the adult. 
The brains at the museum are fixed in saline-formalde- 
hyde — sufficient strength of the former to suspend the 
organ in the container and four percentage of the latter. 
When fixation is complete, as indicated by density, preser- 
vation is done in one per cent, formaldehyde, the organ, 
usually bound in gauze, being laid in cotton. A list of 
