204 AGE, GROWTH, AND DEATH 



turn his ear, much less his head, to inspect the train 

 which a short time before so frightened him and held 

 his attention that nothing else could get into his 

 mind save the fright the train gave him. So we, too, 

 act a good deal like the horse. We see a thing the 

 first time and it surprises us; the next time it seems 

 like an old acquaintance, a thing familiar and there- 

 fore unregarded. I say this apropos of the skin. 

 How many of you have thought what the lesson of 

 the skin is in regard to the power of growth? Spring 

 is coming ; we shall soon be taking to our boats, row- 

 ing or canoeing, and the first day we do so doubtless 

 we shall have blisters upon our hands, and the outer 

 part of the skin, raised by the blister, will probably 

 fall off and be lost altogether. The softer underlying 

 skin will be exposed, will be sensitive and uncomfort- 

 able for a while, but soon the cells behind the surface 

 will assume a horny character, the cells underneath 

 will grow and multiply, and presently the wound will 

 be healed over. Did you ever stop to think that 

 that means that there is a reserve power of growth in 



P. Fraisse, Die Regeneration von Geweben und Organen bet den Wirbel- 

 thieren, Berlin, 1885. 



Nauwerck, Uebcr Muskelregeneration nach Verletzungen, Jena, 1890. 



R. Volkmann, " Ueber die Regeneration des quergestreiften Muskelgewebes 

 beitn Menschen und Saugethier," Ziegler's Beitrdge Pathol., xii., 233, 1893. 



E. Ziegler, " Ueber die Reparation verletzter Gewebe," Deutsche med. Woch- 

 enschrift, 1900, p. 783. 



Alex. Schmincke, "Die Regeneration der quergestreiften Muskelfasern bei 

 den Wirbelthieren. EinevergleichendpathologischeStudie. I. Ichthyopsiden," 

 Verhandl. Phys.-med. Gesellschaft Wurzburg, N. F. ,xxxix., 15-130, Tafel I., 

 II. (Gives an exhaustive review of previous investigations.) 



