66 Transmission-time of Reflexes in Spinal Cord of Frog 



EXPLANATION OF FIGURES. 



On each positive used, an exactly vertical line was ruled from the spot in the 

 record of the signal which represents the moment of excitation to the zero line of 

 the curve. Subsequently (for the sake of economising space) the signal-record itself 

 was cut off in all the positives, with the exception of those used for figs. 1, 2, 4, 9 A, 

 and 13 A and B. The photographs have not been "touched" in any other way, 

 except that in some the shaded part has been darkened for purposes of photographic 

 reproduction. They are to be read from right to left, and the ruled vertical line 

 is consequently to be seen on the right-hand side of each. In the photographs 

 themselves the vertical lines mark the time, and their number per second is stated 

 below for each. The horizontal lines, when present, mark in millimetres the height 

 to which the projected image of the meniscus rose. 



