OCR Text |
Show 418 UTRICULARIA NEGLECTA. CHAP. XVII. In this latter case, as so on as the pressur. e is relaxedf , air in and the bladder recovers Its proper orml . is drawn ' 1 . d under water and again gent y If it is. now Pace h 'fi d d minute bubbles issue from t e ohn bcle dadn preWsshee r ' h . that the walls of t e a er '£l. else, s oWlng · . · C h nhoa ve n.ovt b. een rupt ur.e d · I mention this b·e cause o bn quotes a statement b Y Treviran us., tha.t au· caWnn ot e d t f bladder without ruptunng It. , e may force ou o a. · · ed 'th' therefore cone l u d e that whenever au IS· secret W'lI l bIn a. bladd, .e r a l read y full of water' s~ ome wHa ter WII e slowly d n.v en out through the onl ficde . end eed cand ·dl doubt that the numerous. g an s crow e roun har Y. · d ted to absorb matter from the the onfice are a ap . 1 f· putn. d water., wh 1'c h will oc.c asional y escape rom bladders including decayed anima1s . _. oncluf'ion, I experimented with various In ()rder to test thi~ c As in the case of the qu~drifids, salts solutions ~n the gla~ s. since these are generated by the final of ammoma. were tr~e~, nder water. Unfortun3Jtely the glands decay of arumal ma~t er u . d whilst attached to the bladders e~nnot be c~refully examu~.e ummits therefore, including tho in their· entue state. Theu s 1- '.::JJ off and the condition l d ntennre were s 1ceu: , valve, col ar, atn a d. the' were then irrigated, whilst beneath o[ the g~ancls Iobser-v~th they solutions, amd after a time rc-oxa coverrng g ass,. WI . as before namely No.8 of Hart- :lllmined! with the same power ' J ~· ll . o- periments were thus maae. naJclt. The o owino. ex t ,,..ti'A.ns of one lf)art of white sugar A tro~ experunen SO'lu. VtLJ .£-' t sa con f . t , 218 of water were :first used, o sec and of one part 0 ' gum 0 , . in the 'lands It was whethe:r these pr~!ucecl a~:t~~;~~:. O'lands ;ere affected by also· neces~a:Fy to 0 erve w i bee~ cut off. The summits the summits of the bladders hav.ng . d "'·fter 2 hrs 30m. th t · d . one bemg examine w • ' of four were us rie ' oo- b . but there was no marked a.nd the other three after .Lit). rs. ' · th glands of any of them. . d change UL e . . nite colourless glands were irngate Two sum:rrnts bearmg q · · f the same strength with a solution of carbo11l!ate- of)amm~n:a ~ m the primordial (viz. one pa.ft to. 2:18 of ~~te;;r:~on::what. ~ontracted; they u tr icles of most of t_he glamkd!s t bes and bad assumed a pale were also thickened In spec s or pa c ' CHAP. XVII. ABSORPTION BY THE GLANDS. 419 brown tint. When looked at again after 1 hr. 30m., most of them presented a somewhat different appearance. A third specimen was treated with a weaker solution of one part of the carbonate to 437 of water, and after 1 hr. the glands were pale brown and contained numerous granules. Four summits were irrigated with a solution of one part of nitrate of ammonia to 437 of water. One was examined after 15 m., and the glands seemed affected; after 1 hr. 10 m. there was a greater change, and the primordial utricles in most of them were somewhat shrunk, and included many granules. In the second specimen, the primordial utricles were considerably shrunk and brownish after 2 brs. Similar effects were observed in the two other specimens, but these were not examined until ~1 hrs. had elapsed. The nuclei of many of the glands apparently had increased in size. Five bladders on a branch, which had been kept for a long time in moderately pure water, were cut off and examined, and their glands found very little modified. The remainder of this branch was placed in the solution of the nitrate, and after 21 hrs. two bladders were examined, and aJI their glands were brownish, with their primordial utricles somewhat shrunk and :finely granular. The summit of another bladder, the glands of which were in a beautifully clear condition, was irrigated with a few drops of a mixed solution of nitrate and phosphate of ammonia, each of one part to 437 of water. After 2 hrs. some few of the glands were brownish. After 8 hrs. almost all the oblong glands were brown and much more opaque than they were before ; their primordial utricles were somewhat shrunk and contained a little aggregated granular matter. The spherical glands were still white, but their utricles were broken up into throe or four small hyaline spheres, with an irregularly contracted mass in the middle of the basal part. These smaller spheres changed their formfJ in the course of a few hours, and some of them disappeared. By the next· morning, after 23 hrs. 30 m., they had all disappeared, and the glands were brown; their utricles now formed a globula-r shrunken mass in the middle. The utricles of the oblong glands had shrunk very little, but their contents were somewhat aggregated. Lastly, the summit of a bladder which had been previously irrigated for 21 hrs. with a solution of one part of sugar to 218 of water without being affected, was treated with the above mixed solution; and after 8 hrs. 30 m. all the glands became brown, with their primordial utricles slightly shrunk. Four summits were irrigated with a puh'id imfusion of raw 2 E 2 |