340 UTRICULARIA NEGLECTA. [Chap. XVII. 



hrs. with a solution of one part of sugar to 218 of water without 

 being alFected, was trcuted with the above mixed solution; and 

 after 8 hrs. .'iO m. all the glands became brown, with their primor- 

 dial utricles slightly shrunk. 



Four summits were irrigated with a putrid infusion of raw meat. 

 No change in the glands was observable for some hours, but after 



24 hrs. most of them had become brownish, and more opacjue and 

 granular than they were before. In these specimens, as in those 

 irrigated with the salts of ammonia, the nuclei seemed to have 

 increased both in size and solidity, but they were not measured. 

 Five summits were also irrigated with a fresh infusion of raw meat; 

 three of these were not at all affected in 24 hrs., but the glands 

 of the other two had perhaps become more granular. One of the 

 specimens which was not affected was then irrigated with the 

 mixed solution of the nitrate and phosphate of ammonia, and after 

 only 25 m. the glands contained from four or five to a dozen 

 granules. After six additional hours their primordial utricles were 

 greatly shrunk. 



The summit of a bladder was examined, and all the glands 

 found colourless, with their primordial utricles not at all shrunk; 

 yet many of the oblong glands contained granules just resolvable 

 with No. 8 of Hartnack. It was then irrigated with a few drops 

 of a solution of one part of urea to 218 of water. After 2 hrs. 



25 m. the spherical glands were still colourless; whilst the oblong 

 and two-armed ones were of a brownish tint, and their primordial 

 utricles much shrunk, some containing distinctly visible granules. 

 After 9 hrs. some of the spherical glands were brownish, and the 

 oblong glands were still more changed, but they contained fewer 

 separate granules; their nuclei, on the other hand, appeared larger, 

 as if they had absorbed the granules. After 23 hrs. all the glands 

 were brown, their primordial utricles greatly shrunk, and in many 

 cases ruptured. 



A bladder was now experimented on, which was already some- 

 what affected by the surrounding water; for the spherical glands, 

 though colourless, had their primordial utricles slightly shrunk; 

 and the oblong glands were brownish, with their utricles much, 

 but irregularly, shrunk. The summit was treated with the solu- 

 tion of urea, but was little affected by it in 9 hrs.; nevertheless, 

 after 23 hrs. the spherical glands were brown, with their utricles 

 more shrunk; several of the other glands were still browner, with 

 their utricles contracted into irregular little masses. 



Two other summits, with their glands colourless and their 

 utricles not shnmk, were treated with the same solution of urea. 

 After 5 hrs. many of the glands presented a shade of brown, with 

 their utricles slightly shrunk. After 20 hrs. 40 m. some few of 

 them were quite brown, and contained irregularly aggregated 

 masses; others were still colourless, though their utricles were 

 shrunk ; but the greater number were not much affected. This was 

 a good instance of how unequally the glands on the same bladder 

 are sometimes affected, as likewise often occurs with plants grow- 

 ing in foul water. Two other summits were treated with a solu- 



