PLATE 1 



EXPLANATION OF FIGURES 



I A cross section of the superficial Lateral or dark muscle of salmon no. 

 97, a fish from the McCloud River at Baird, California. This preparation was 

 made as afrozen section of material after a fixation of four months in 10 per cent 

 formalin. The section was sj ained in an alkaline-alcoholic solution of scarlet red 

 fat stain and counterstained with Delafield's haematoxylin. It was mounted in 

 glycerine. The figure shows a striking amount of fat present throughout the 

 fibers with a few large globules between the fibers. Magnification, Leitz ocular 

 3, objective 7, camera luclda outlines. 



2 A cross section of the superficial lateral or dark muscle of fish no. !'7. 

 from the McCloud Rivera! Baird. ( 'alifornia. The material is st ained with Mal- 

 lorv's aniline blue connective tissue stain. The figure is characterized by the 

 large number of clear spaces which represent vacuoles produced by the extracting 

 of the fat in the imbedding process. Magnification, Leitz ocular 3, objective 

 1/12, camera lucida outlines. 



ISO 



