DETERMINATION OF CRITICAL POINT OF DEATH 167 



traces the movement of the spot of light with a pencil. The 

 whole recording apparatus and the source of light being thus 

 placed on the same stand, any ordinary disturbance will 

 affect all equally, and cause no irregularity therefore in the 

 movement of the recording spot (fig. 84). 



Fig. 84. The Morograph 



Record may be taken by following excursion of spot of light on screen to the left. 

 For photographic record, plate-holder is substituted for screen. 



I have given a great deal of space to the description of 

 these details, because on them depends the accuracy and 

 perfection of the results. The record may now be made 

 on any scale of magnification, without misgiving. In fact 



