GROWTH-CHANGES IN MAMMARY APPARATUS OF DASYURUS. 187 
The Growth-Changes in the Mammary Apparatus 
of Dasyurus and the Relation of the Corpora 
Lutea thereto. 
By 
( lias. II. O'Donogtiue, B.Sc., F.Z.S., 
Assistant to the Jodrell Professor of Zoology, University College, 
London. 
With Plates 22 and 23, and 2 Text-figures. 
Table op Contents. 
page 
Introduction ...... 188 
Material ...... 189 
Formation of the Gland .... 192 
The Adult Gland ..... 196 
Changes prior to Ovulation .... 198 
Changes during Pregnancy .... 199 
The Pouch . . . .199 
The Cutaneous Glands of the Pouch Area . 200 
The Mammary Glands .... 201 
Changes after Parturition .... 203 
The Cutaneous Glands of the Pouch Area . 203 
The Mammary Glands .... 203 
The Nature of Milk Secretion . . . 205 
Changes when Ovulation is not Succeeded by Preg- 
nancy ...... 208 
The Cutaneous Glands of the Pouch Area ' . 209 
The Mammary Gland .... 210 
Stimulus inciting Growth in the Mammary Gland . 212 
The Nature of the Stimulus . . . .212 
The Origin of the Stimulus .... 213 
The Importance of the Ovary . . 215 
The Functions of the Corpus Luteum . . 216 
The Cause of Milk Secretion .... 223 
General Summary ..... 224 
VOL. 57, PART 2. NEW SERIES. 15 
