Fig. 3 Mammary gland of a rabbit two months old, prepared like that shown 

 in figure 2. The ducts are cut off near the base of the nipple; only a few of the 

 larger blood vessels are shown; length of longest duct 5 mm. Magn. 8 diam. 



Fig. 4 Two main ducts and their branches of a mammary gland of a fullgrown 

 virgin rabbit, prepared as described tor figure 2. A tew of the arteries supplying 

 the gland are shown; length of longest duct 10 mm. Magn. 8 diam. 



519 



