VIII.] STRUCTURE OF CONTRACTILE TISSUES. 87 



ends, granules are more abundant in the 

 protoplasm. 



b. The arrangement of the fibre-cells in bands 

 and sheets: the fibres may frequently be seen 

 projecting like a palisade from the torn end 

 of a band. 



10. Take a small strip of unstriated muscle as in 9 

 and tease it out in salt solution. 



The sheets and bands of the tissue are fairly 

 transparent, the individual fibre cells are scarcely 

 visible. Add acetic acid, *1 to '5 p.c., the cells 

 become for a short time somewhat more obvious, 

 and the nuclei very distinct, often showing one 

 or two nucleoli 



11. Make longitudinal vertical sections of the mus- 

 cular coats of the cardiac end of a cat's or dog's 

 stomach. The tissue should have been pinned 

 out, placed in Miiller's fluid for two to four weeks 

 and then treated with alcohol. Stain with 

 carmine or haBmatoxylin and mount 1 . Observe 



The cells are arranged in bundles, probably 

 this will be distinct in the inner (circular) 

 coat only, the outer (longitudinal) coat being 

 cut parallel to the direction of its bundles. 

 Note the nuclei of the cells in the inner coat ; 

 these will be seen in some only of the cells 

 and will appear as largish deeply stained cen- 



1 When it is indifferent whether a tissue be mounted in glycerine 

 or in Canada Balsam, neither is mentioned ; if balsam is used, of 

 course the tissue must be treated with creosote, etc. (cp. p. 75). 



