I 



RA 1 : 



! 



Ro; 



PLATE IV 



Fig. i. Section of a typical corpus luteum of pregnancy (bar = i cm.). 



Fig. 2. Photomicrograph of a thick cleared section of a corpus luteum 



to show vascular and avascular septa (bar = i mm.). 

 Fig. 3. Photomicrograph of corpus luteum of a pregnant female; foetus 



0-47 m; fixed Zenker-formol, post-osmicated, not counterstained 



(bar = 200/1). 

 Fig. 4. Photomicrograph of corpus luteum of a pregnant female, foetus 



2-47 m; treatment as in fig. 3 (bar = 200 fi). 

 Fig. 5. Photomicrograph of corpus luteum of a pregnant female; foetus 

 ' 5- i S m; treatment as in fig. 3 (bar = 500/.). 



Fie. 6. Photomicrograph of ovarian cortex of immature female, body 

 length 54 feet, showing primary follicles; fixed Bouin, stained 

 Masson's Trichrome (bar = 200/t). 



