CONTENTS 
No. 1. JANUARY 
GerorGE L. STREETER. Factors involved in the formation of the filum terminale. Three 
ENGST OUI CS Sarge Panta te ENED Pree mente treed cB 2 Hat scch adie plea otis RTE ME OED Sree ft 
J. A. BapertscHer. The ultimobranchial bodies in postnatal pigs (Sus scrofa). Four 
HOU CSeeee eee BO Greboiatg a hia ke Ut Gas Gord OER CE eae ORE oie ecto eae ic Orne C. 
FRANK haees edema “The origin of the phagocytic mononuclear cells of the 
peripheral blood. Eleven figures. . Ba 27 
H. D. Sentor. The development of the sieibes a tite ipa apes eaeuien "Bleven 
THEW INS Sh oe ctor rg Etna EN get oo Se PURGE CR i Se a Do ME 19) 
No. 2. MARCH 
C. H. DanrortH. The ane relations of brachydactly in the domestic fowl. 
Five figures. oe o We 
Dexa Dries. eraciee on inet ovary Os “fhe pperamonie (Gomaneniite eielioe eudecont 
lineatus) with special reference to the corpus luteum. Twenty-nine figures........ 117 
Royat Norton CHapMan. A study of the correlation of the pelvic structure and the 
habits of certain burrowing mammals. Five plates (twenty-six figures)............ 185 
No. 3. MAY 
C.M. Jackson. The postnatal development of the suprarenal gland and the effects of 
inanition upon its growth and structure in the albino rat. Ten figures. sae PPall 
Joun C. Donatpson. The relative volumes of the cortex and medulla of ang eee 
gland in the albino rat. Four charts.. Ae. Me eee. 20 
FRANKLIN PARADISE JOHNSON. The eooleamiont of the jopule an ie pig’s silva ne 
eight figures. . : .. 299 
Lucite WITTE. Pie eoeeneais a ae fees mmmeele ae the pig in reiaiee fa the poueinemnes 
and development of the intercalated discs. Two plates (eighteen figures).......... 333 
NozA JULY 
Epwarp Puecps Auuis, Jr. The homologies of the maxillary and vomer bones of Polyp- 
terus. Three hee (eighteen figures)... pee . 349 
J.A.Mynrs. Studieson themammary Hemel, “iy, The fieealoey a hed mammary ation in 
male and female albino rats from birth to ten weeks of age. Nineteen figures (eleven 
text figures and two plates).. ; . 395 
H. E. Jorpan. The histology of fhe blood one fis réd bone -marrow oe ihe aed frc og, 
Rana pipiens. Two plates (seventy-three figures) >...........:..0ccccecccsccccvsecs 437 
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