Chap. X. TRANSMISSION OF MOTOR IMPULSE. 239 



with No. 5 that bits of meat had to be added thrice 

 before all the short tentacles on the opposite side of 

 the disc were inflected. 



The result was widely different when bits of meat 

 were placed in a medial line at the distal or proximal 

 ends of the disc. In three of the seventeen experi- 

 ments thus made, owing either to the state of the leaf 

 or to the smallness of the bit of meat, only the im- 

 mediately adjoining tentacles were affected ; but in the 

 other fourteen cases the tentacles at the opposite end 

 of the leaf were inflected, though these were as distant 

 from where the meat lay as were those on one side of 

 the disc from the meat on the opposite side. In some 

 of the present cases the tentacles on the sides were not 

 at all affected, or in a less degree, or after a longer 

 interval of time, than those at the opposite end. One 

 set of experiments is worth giving in fuller detail. 

 Cubes of meat, not quite so small as those usually em- 

 ployed, were placed on one side of the discs of four 

 leaves, and cubes of the same size at the proximal 

 or distal end of four other leaves. Now, when these 

 two sets of leaves were compared after an interval of 

 24 hrs., they presented a striking difierence. Those 

 having the cubes on one side were very slightly 

 affected on the opposite side; whereas those with the 

 cubes at either end had almost every tentacle at the 

 opposite end, even the marginal ones, closely in- 

 flected. After 48 hrs. the contrast in the state of the 

 two sets was still great ; yet those with the meat on 

 one side now had their discal and submarginal ten- 

 tacles on the opposite side somewhat inflected, this 

 being due to the large size of the cubes. Finally we 

 may conclude from these thirty-five experiments, not 

 to mention the six or seven previous ones, that the 

 motor impulse is transmitted from any single gland 



