OBSERVATIONS ON THE HISTOLOGY OF STEIPED MUSCLE. 65 



Further Observations on the Histology of 

 Striped Muscle. 



By 



C. F. Harsliall, H.B., M.Sc, 



Late Piatt Physiological Scholar iu the Oweus College. 



With Plate XI. 



In a recent paper published iu this Journal^ I gave the 

 results of some researches ou the histology of muscular fibre. 

 The present paper is a record of my further investigations ou 

 this subject. These are somewhat incomplete owing to want 

 of time to finish them satisfactorily, but several results have 

 been obtained which I trust are worthy of publication. 



In order to render the questions dealt with more intelligible 

 the summary of results arrived at in the former paper is repro- 

 duced. 



Summary of Former Paper. 



1. In all muscles which have to perform rapid or frequent 

 movements a certain portion of the muscle is differentiated 

 to perform the function of contraction, and this portion takes 

 on the form of a very regular and highly modified intra- 

 cellular network. 



2. This network, by its regular arrangement, gives rise to 

 certain optical effects which cause the peculiar appearances of 

 striped muscle. 



* "Observations on the Structure and Distribution of Striped and Un- 

 striped Muscle in tiie Animal Kingdom, and a Theory of Muscular Contrac- 

 tion," 'Quart. Journ. Micr. Sci.,' 18S7. 



VOL. XXXI, PART I. NEW SER. E 



