Muscular Tissue. 73 



dividual fibres ; with the one- sixth the network in the 

 nucleus can be seen but it will require a one- eighth 

 or Zeiss' E to make out the fibrils passing out of the 

 ends of the nucleus into the body of the cell, look care- 

 fully also for the transverse markings on the cell and 

 the difference of its diameter in some places, compare 

 their appearance with the plate in the Atlas of histo- 

 logy. 



These fibres are very large and give a good idea of 

 the structure of a non- striped muscle fibre. 



In the large area in which this tissue is distributed 

 throughout the body of a mammalian animal, the in- 

 dividual cells are very much smaller and their struc- 

 ture cannot be made out without a high power, 

 especially as they he very thickly together. In the 

 intestine, however, a thin section will show a few 

 fibres running up from the muscularis mucosae to the 

 basement membrane, and in these when well prepared 

 and stained the same structures can be seen as in the 

 much larger ones, in the mesentery of newt. 



To see the intercellular substance by which the mus- 

 cle fibres are held together, take a small portion cut 

 longitudinally from the intestine and prepare it in 

 chromate of ammonia, page 13, and stain in logwood. 

 Cut longitudinal sections so that the circular muscle 

 coat of the intestine is cut transversely, and it will be 

 seen that each fibre is separated from the others by 

 a homogeneous substance the intercellular cement. 

 There will be only a few nuclei cut through and these 

 will be seen deeply stained. 



2. Striped Muscle. Striped muscle is best shown 



