HITHERTO UNDESCRIBED STRUCTURE IN HUMAN HAIR 3 



I-I200th of an inch in diameter; they are apphed edge to edge or 

 nearly so. 



The nuclei are elongated, broader at their extremities than in the 

 middle, and sometimes more or less prolonged at their angles ; their 

 average long diameter may be about i -2000th of an inch, but in this 

 respect they (as the cells) vary a good deal. They appear more or 

 less granular, but do not present any distinct nucleolus. 



Acetic acid renders both cell and nucleus extremely indistinct ; 

 the latter would sometimes appear to become corrugated after the 

 manner of the pus corpuscles, &c. 



The position of this layer of cells is between the fenestrated 

 membrane and the cortical scales ; clear proof of this is obtained 

 when the cortical scales happen to peel off from the shaft and adhere 

 to the inner surface of the sheath. If the focus be adjusted to them, 

 depressing it brings into view, 1st. the layer of nucleated cells; 2nd. 

 the fenestrated membrane. 



Subjoined is a drawing of the inner surface of a hair sheath, 

 illustrating this. 



Possibly it is the layer of cells here described which has been 

 confounded by Kohlrausch and Krause with the fenestrated membrane, 

 which has been described by Henle as consisting of anastomosing 

 longitudinal fibres, and by Meyer (cited in Professor Henle's " Allge- 

 meine Anatomic," p. 295), as a stage of development of the cortical 

 scales. 



B 2- 



