(41

Ch X

view, that the same tendency is should be communicated to the walls, in contact with the protoplasm, buried in the walls of the of certain properly adapted cells; & if so their molecules would approach each other with force & the cell-wall would contract.)

It is hardly probable that the protoplasmic fluid within the cells itself contracts at first; for the aggregation process affects all the cells of the tentacles, & yet there is no bending except at one point.

(To this view it may with much force be objected that when leaves are immersed in various rather strong solutions, or are subjected to a heat of above 130° Fah. strong aggregation is rendered ensues, but no movemnt & we may, On the other hand, various acids & other fluids cause rapid movement, but do not not no aggregation, or only of an abnormal nature, or only after a long interval of time; but as most of these fluids, however appear to are be more or less injurious, & they may then stop or delay st check the aggregating process by injuring or killing the protoplasm. There is another & more important difference in the two processes: when the glands on the disc are excited, & then the motor impulse which proceeding from them travels up all the adjoining tentacles & acts on the cells at the bending point place, but does not