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Vol. VIII. DETROIT, AUGUST, 1888. No. 8 



ORIGINAL COMMUNICATIONS. 



FOKM, ENDINGS AND RELATIONS OF STRIATED, MUSCU- 

 LAR FIBERS IN THE MUSCLES OF MINUTE 

 ANIMALS (MOUSE, SHREW, BAT AND 

 ENGLISH SPARROW.)* 



[theee plates.] 



susanna phelps gage, ph. b. 



PART I. 



TN Kolliker's fHistology, (1867) p. 158, occurs the following state- 

 -*- ment: "In short muscles (the side muscles of fish, the limb 

 muscles of the bat and the muscles of the frog) all the fibers are of 

 the length of the muscle and have rounded ends. In long muscles 

 the fibers are from 30 to 40 mm. in length. Far more numerous 

 investigations are necessary to determine whether in all muscles of 

 less length than 30 to 40 mm., the fibers are as long as the muscle 

 itself." Since 1867 investigations as to the form and length of mus- 

 cular fibers have not been numerous and, as far as I know, have been 

 turned exclusively in the direction of man and the larger animals. 



In order to carry the knowledge of the more obvious structure 

 of muscle a step farther it was thought desirable to determine the 

 length, form and relation of the fibers in minute animals. The 

 larger part of the present investigation was made upon mice. 



*The work on this article was done in the Anatomical Laboratory of Cornell Uni- 

 versity, and its main features were presented at the meeting of the American Society of 

 Microscopists, August, 1887. 



tFor all references to authors see the alphabetically arranged bibliography at the 

 end of Part II, where will be found briefly summarized the literature bearing directly upon 

 this paper. 



