AUTHOR’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, MARCH 2. 
COMPARATIVE STUDIES ON THE GROWTH OF THE 
CEREBRAL CORTEX 
VI. PART I. ON THE INCREASE IN SIZE AND ON THE DEVELOP- 
MENTAL CHANGES OF SOME NERVE CELLS IN THE CEREBRAL 
CORTEX OF THE ALBINO RAT DURING THE GROWTH OF THE 
BRAIN 
VI. PART II. ON THE INCREASE IN SIZE OF SOME NERVE CELLS 
IN THE CEREBRAL CORTEX OF THE. NORWAY RAT (MUS NOR- 
VEGICUS), COMPARED WITH THE CORRESPONDING CHANGES 
IN THE ALBINO RAT 
NAOKI SUGITA 
From the Wistar Institute of Anatomy and Biology 
WITH SIX FIGURES AND FOUR CHARTS 
PAR I 
I. PRELIMINARY STUDIES 
As a preliminary to the study of cell size, I made a comparison 
of effects of several fixatives and imbedding media on the size and 
shape of the cortical nerve cells in a small number of albino rats. 
These studies were made after considering the results of King 
(10) and Allen (16), both of whom were endeavoring to find 
methods which caused the minimum alteration in the nerve cells. 
For this comparison, ten kinds of preparations were made from 
albino rat brains of like age: thus, as the fixative, (1) Bouin’s 
fluid, (2) 4 per cent formaldehyde, (3) 95 per cent: alcohol, (4) 
Miiller’s or Orth’s fluid, and (5) Ohlmacher’s fluid were suc- 
cessively tried, and each sample was inbedded in (A) parafine 
and in (B) celloidin. 
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