132 ELEMENTARY BIOLOGY. [CHAP. 



a. Connective tissue elements. 



ft. Ripe fat cells ; obvious as aggregates of large 



highly refractive globules (fat globules) of which 



the tissue is chiefly composed. 



Note their optical characters, under different 



levels of focus. 

 y. Immature fat cells ; smaller irregular or rounded 



cells, each lodging one or more fat drops. 



b. Preserve in spirit ; stain with hagmatoxylin. Ex- 

 amine the ripe cells under a high power; each 

 consists of-- 



a. The fat globule ; apparent as a clear space, 

 which may or may not contain crystals. 



(3. The cell membrane ; deeply stained and more or 

 less granular, forming a thin envelope for a. 



y. The nucleus ; oval and compressed, buried up 

 in the cell membrane and usually surrounded 

 by granular protoplasm. 



8. Imtnature fat cells ; look for those showing 

 stages in the formation of the fat globule. 



7. Unstriped muscle. 



a. Place a small piece of the muscular coat of the 

 intestine in Miiller's fluid for 2 3 days. Tease 

 up in haematoxylin solution and examine under a 

 high power. 



a. The muscle-cells ; elongated and fusiform, in 

 close apposition with each other ; protoplasm 

 granular. 



ft'. Nucleus ; fusiform or ovoidal, generally situated 

 near the middle of the cell. 



