424 UTKICULAEIA NEGLECTA. Chap. XVII. 



ammonia, from a putrid infusion of raw meat, and from 

 urea. The glands apparently are acted on more 

 strongly by a solution of urea, and less strongly by 

 an infusion of raw meat, than are the processes. The 

 case of urea is particularly interesting, because we 

 have seen that it produces no effect on Drosera, the 

 leaves of which are adapted to digest fresh animal 

 matter. But the most important fact of all is, that 

 in the present and following sj)ecies the quadrifid 

 and bifid processes of bladders containing decayed 

 animals generally include little masses of spontane- 

 ously moving protoplasm ; whilst such masses are 

 never seen in perfectly clean bladders. 



Development of the Bladders. — My son and I spent 

 much time over this subject with small success. Our 

 observations apply to the present species and to Utri- 

 cularia vulgaris, but were made chiefly on the latter, as 

 the bladders are twice as large as those of TJtricularia 

 neglecta. In the early part of autumn the stems ter- 

 minate in large buds, which fall off and lie dormant 

 during the winter at the bottom. The young leaves 

 forming these buds bear bladders in various stages of 

 early development. When the bladders of Utricularia 

 vulgaris are about -p^ inch ('254 mm.) in diameter 

 (or ^-^ in the case of TJtricularia neglecta), they are 

 circular in outline, with a narrow, almost closed, trans- 

 verse orifice, leading into a hollow filled with water ; 

 but the bladders are hollow when much under -j-^ of 

 an inch in diameter. The orifices face inwards or 

 towards the axis of the plant. At this early age the 

 bladders are flattened in the plane in which the orifice 

 lies, and therefore at right angles to that of the 

 mature bladders. They are covered exteriorly with 

 papillae of different sizes, many of which have an 

 elliptical outline. A bundle of vessels, formed of 



