394 



PRACTICAL HISTOLOGY. 



[xxxvii. 



globules. The active gland presents some resemblance to a salivary 

 gland, so closely are the alveoli pressed together, with only a small 

 quantity of interstitial connective tissue between them. The acini 

 are in groups and separated from each other by fibrous imperfect 



septa. Numerous cor- 

 puscles, including granu- 

 lar cells, occur in the 

 alveolar connective tis- 

 sue. The ducts are 

 lined by columnar epi- 

 thelium, and in a section 

 of a human gland they 

 appear large. 



(i.) Harden small 

 parts of the mammary 

 gland in absolute al- 

 cohol. Select, when 

 possible, the gland of 

 a recently pregnant 

 woman (or animal). 



Fia. 365. T.S. Mammary Gland. D. Duct; A. Group Qfnir, fk rw.fi' 

 of acini with much connective tissue between, x 20 btaln the . sectl Ons m 



hsematoxylin and mount- 

 in balsam, i.e., to get a general view of the gland structure. Stain 

 in bulk, embed and cut in paraffin. 



(ii.) Harden very small pieces of a fresh gland, e.<j., from a 



FIG. 366. T.S. Secreting Mammary Gland, Mouse. 

 Pol's solution and safranin, x 300. 



'o " " " o-^-aff QV r~*& 



Fia. 367. Colostrum. 



pregnant cat or rabbit, in Flemming's mixture and stain the 

 sections (very thin) in safranin. 



1. V.S. Mammary Gland (Hcematoxytin) (L and H) (fig. 365). 



(a.) Observe the groups of acini, separated by a relatively large 



