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Show 48 DROSERA ROTUNDIFOLIA. CHAP. III. . . h lls of the tentacles often aggro-mon am ia, the flu.i d withhi nr et ne tvci~S CI· a matter' form.i ng a kindd ho f gates exteriorly Into co e times appear within this bag, an ~ e bag. Small spheres so~~des into two or more spheres, whJCh hole generally soon diVI d' ·a After a longer or shorter rwe peatedly coalesc~ a nd re IV I e. h · 1 1 less layer of protoplasm, w IC 1 ti.me the granules In the codo.ur to and unite with the larger h lis are rawn b . ,. flows round t e wa , . de endent spheres; these latter emg Ot spheres, or form smalllnd ~oro brittle than the first aggregated a much paler colour, an 1 f protoplasm have been thus masses. After the gran~ es o roto lasm can no longer be diRattracted, the layer of flow:ngt pf li!pid fluid etill flows round t1. ngm.s h ed , though a curren o the walls. . ery strong almost concentrated, If a leaf is immersed In a v . the' glands are instantly b te of ammonia, h solution of car ona . sly. but no movement of t e blackened, and they secrete copitoh:s t~eated became after 1 hr. tentacles ensues. Tw. o dle .a ve1s1 the cells in thel.l ' ton t ac 1e s con-flaccid, and seemed lnlle ia~m but these were small and d~stained spheres of protop '. placed in a solution not qmte T ther leaves were . . 30 coloured. wo o was well-marked aggregatiOn In m .. so strong, and there . 1 ore commonly oblong masses of After 24 hrs. the sphenca or ~ granular instead of being as protoplasm beca~e op~q~~ ~~e lower cells there were only usual transluce~t' an ·ical ranules. It wa . evident that innumerable minute ~p~~r hal interfered with the completion the strength of the so ub I~f ee likewise follows from too great of the process, as we s a s heat. . late to the exterior tentacles, All the foregoing observ~~~;~ ~~t the green pedicels of the which are of a purple c t' d on by the carbonate, and by short central tentaeles ar~ ac e tly the same manner, with the . . f raw meat In exac . . h an Infuswn o ' O'ated masses are of a greems sole difference that the aggrel:? . no way depend n t on the l . so that the process 1s In co our' . 'th' the cells . colour of the fluid WI In k bl f~ct with respect to this salt IS Finally, the most remar a et hich suffices to cause aggrethe extraordinary .smal.l amou~ w . the seventh chapter, and gation. ~ull details will be giv~~a~n with a sensitive leaf t~e here it . will be enough to say f ·n (. 000482 mgr.) IS 1 d f 1_ o a grai absorptwn by a g an o 13'44oo 11- rked ao·grega-ough to cause in the course of one hour we d rna o ~~n in the cells immediately beneat~ tf,~ ~~~Two leaves were The lf;fjects of certain other alts an I ~~ sf monia to about placed i~ a solu~ion of one part of aceta eo am CHAP. III. THE PROCESS OF AGGREGATION. 49 146 of water, and were acted on quite as energetically, but perhaps not quite so quickly, as by the carbonate. After 10m. the glands were black, and jn the cells beneath them there were traces of aggregation, which after 15m. was well marked, extending down the tentacles for a length equal to that of the glands. After 2 hrs. the contents of almost all the cells in all the tentacle's were broken up into masses of protoplasm. A leaf was immersed in a solution of one part of oxalate of ammonia to 146 of water; and after 24 m. some, but not a conspi~uous, change could be seen within the cells beneath the glands. After 47 m. plenty of spherical masses of protoplasm were formed, and these extended down the tentacles for about the length of the glands. This salt, therefore, does not act so quickly as the carbonate. With respect to the citrate of ammonia, a leaf was placed in a little solution of the above strength, and there was not even a trace of aggregation in the cells beneath the glands, until 56 m. had elapsed; but it was well marked after 2 hrs. 20 m. On another occasion a leaf was placed in a stronger solution, of one part of the citrate to 109 of water (4 grs. to 1 oz.), and at the same time anothe1· leaf in a solution of the carbonate of the same strength. The glands of the latter were blackened in less than 2 m., and after 1 hr. 45 m. the aggregated masses, which were spherical and very dark-coloured, extended down all the tentacles, for between half and two-thirds of their lengths; whereas in the leaf immersed jn the citrate the glands, after 30 m., were of a dark red, and the aggregated masses in the cells beneath them pink and elongated. After 1 hr. 45 m. these masses extended down for only about one-fifth or one-fourth of the length of the tentacles. Two leaves were placed, each in ten minims of a solution of one part of nitrate of ammonia to 5250 of water (1 gr. to 12 oz.), so that each leaf received 5~6 of a grain (' 1124 mgr.). This quantity caused all the tentacles to be inflected, but after 24 hrs. there was only a trace of aggregation. One of these same leaves was then placed in a weak solution of the carbonate, and after 1 hr. 45 m. tho tentacles for half their lengths showed an astonishing degree of aggregation. Two other . leaves were then placed in a much sti·onger solution of one part of the nitrate to 146 of water (3 grs. to 1 oz.); in one of these there was no marked change after 3 hrs.; but in the other there was a trace of aggregation after 52 m., and this was plainly marked after 1 hr. 22m., but even after 2 hrs. 12 m. there was certainly not more aggregation than would have fol- E |