AUTHOR'S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, AUGUST 7 
WEIGHTS OF VARIOUS PARTS OF THE BRAIN IN 
NORMAL AND UNDERFED ALBINO RATS 
AT DIFFERENT AGES 
C. A. STEWART 
Institute of Anatomy, University of Minnesota, Minneapolis 
ONE FIGURE AND THREE TABLES 
CONTENTS 
Meatertalvandrmethodsee cic r mnt tant ns ce? cicctiet Montiel oe eat eet eae 512 
JBI eee ROBIE te ROA 1 REAL ARE oh CG AA AE RR PODS uae Gea O BGC Ua een) 2 515 
(CHIE oF ADT, SHON es EME oh LPO ein ot Cay he a a | A eet eee RON eRe PPh. RO eT 519 
Brain ES GCMs errr ae Rye ee ee eels oth ie ck poe SONG EE Re eT meas 521 
(Crests) oy sbi livb cates ot aya lag MOR ls aun Bt Ct Ca Alb dc OER gk Me lta 522 
Olfactory bulbs 3h. Ares b erie. ck. Po ee, Fae ee ae 523 
DISCUSSIONS. are acy Ee SPN LCR he hE ARES ESO. Se a ee 524 
SS URTNTET OTA ot ian Meee ee ee Pe ED OP, a! can Sheep nog RE cae 526 
SMUD OETA Vise raters Crores ee A ASN cet tao a cys. 5 ea ocla peat tctoend 6 ots EE ti 527 
In connection with an earlier study of the changes in the rela- 
tive weights of the various organs in underfed albino rats (Stewart, 
’18b), the brain was observed to manifest a remarkable tend- 
ency toward continued growth in very young animals, even when 
increase in body weight was prevented. The work has been 
extended in the present investigation to a more detailed con- 
sideration of the growth of separate parts of the brain in severely 
stunted rats. In addition, a considerable number of observa- 
tions was made on the weights of different parts of the brain in 
normal rats at various ages. This phase of the work, however, 
was discontinued when I learned that Prof. H. H. Donaldson, 
of The Wistar Institute of Anatomy, Philadelphia, had under- 
taken the latter problem upon an extensive scale. Fortunately, 
we had each selected the same brain subdivisions for considera- 
tion, so that direct comparison of our results is possible. Dr. 
Donaldson has kindly furnished me with a record of his data for 
511 
