420 ANATOMICAL AND PATHOLOGICAL OBSERVATIONS. 



under water, and one of the lobes is raised out of its capsule, 

 an extremely delicate duct is observed to pass from it into 

 the substance of the capsule, to join the ducts of the other 

 lobes. 



When a section is made through one of the lobes, it be- 

 comes evident that the vesicles are situated principally on its 

 exterior. 



If a small portion be macerated in water for a few hours, 

 and dissected with a couple of needles, there are observed 

 attached to the delicate ducts which ramify through the lobe 

 vesicles in all stages of development. These stages are 

 the following : 1st, A single nucleated cell attached to 

 the side of the duct, and protruding, as it were, its outer 

 membrane. 



2d, A cell containing a few young cells grouped in a mass 

 within it ; the parent cell presenting itself more prominently 

 on the side of the duct. 



3d, A cell attached by a pedicle to the duct, the pedicle 

 being tubular, and communicating with the duct ; the cell 

 itself being pyriform, but closed and full of nucleated cells. 



Ath, Cells larger than the last, assuming more of a globular 

 form, still closed, full of nucleated cells, and situated more 

 towards the surface of the lobe. 



5th, The full-sized vesicles already described as situated 

 at the surface of the lobe. These vesicles are spherical, per- 

 fectly closed ; that part of the wall of each which is attached 

 to the hollow pedicle forms a diaphragm across the passage, 

 so that the vesicle has no communication with the ducts of the 

 gland. The contents of the vesicles are in various stages of 

 development. Those least advanced are full of simple nucle- 

 ated cells ; in others, the included cells contain young cells in 

 their interior, so that they appear granular under low powers ; 

 in others, the included cells have begun at a certain part of 

 the vesicle to elongate into cylinders, with slightly rounded 



