Chapter XIV 



267 — 



The Utricularia Trap 



on the plunger comes into contact with the contact point e, below, 

 and the relay r then stops the motor. The power from the motor 

 is applied to the plunger through the gear p2 etc., ending in a cani c, 

 the whole being adjusted so that the cam comes into a position which 

 allows the lever / to swing downwards when the door is actuated 

 again by, it is confidently hoped, a second mouse. In the meantime, 

 the mouse first caught can employ his time admiring the interior 

 effect, and possibly suggest improvements. A digestion chamber could 

 of course be provided. 



Fig. II. — a mouse trap intended as a model embodying present ideas of the Utric- 

 ularia trap as a mechanism (with apologies to Heath Robinson). 



A captious reader may find difficulty in accepting the analogy as 

 complete. I can say only that he would be right; but at least a pur- 

 pose is served, to indicate that the Utricularia is a pretty complex bit 

 of mechanism. 



Literature Cited: 

 Adowa, a. N., Zur Frage nach den Fermenten von Utricularia vulgaris L., I. Bioch. Z. 



150:101-107, 1924; II. 153:506-509, 1924. XT ^^ TJ . /- ^ A 



Barnhart, J. H., Segregation of genera m Lenhbulariaceae. Mem. N. Y. Bot. Lrard. 6:39- 



Bath, \v., liber Kaulquappen in den Fangblasen von U. vulgaris. Sitzungsber. d. Ges. 



Naturforsch. Freunde Berlin 1905:153-155- „ . . 



Benjamin, L., Uber den Bau und die Physiologie der Utriculanen. Botan. Zeitung 6:1-5; 



17-23; 45-50; 57-61; 81-86, 1848. 

 Brocher, Frank, Le probleme de I'Utriculaire. Ann. de Biol, lacustre 5:33-46, 19"- 

 Brocher, F., a propos de la capture d'anopheles par les Utriculaires. Ann. Parasitol. 5: 



Brumpt, E., Capture des larves de Culicidees par les plantes du genre Utricularia. Ann. de 



Parasit. humaine et compar. 3:403-411, 1925- 

 Buchenau, Franz, Morphologische Studien an deutschen Lentibularieen. Botan. Zeitung 



23:61-66;. .69-71; 77-80; 85-91; 93-99. 1865. ^ . rr. ■ , ■ 1 • T 13 



BtJSGEN, M., Uber die Art und Bedeutung des Tierfangs bei Utricularia vulgaris L. Ber. 



d. deutsch. bot. Gesellsch. 6:55-63, 1888. 

 Candolle, a. p. DE, Physiologie vegetale 11:528, 1832. 



Chandler, Bertha, Utricularia emarginata Benj. Ann. Bot. 24:549-555, 19 10. 

 Clarke, W. G. and R. Gurney, Notes on the genus Utricularia and its distribution in 



Norfolk. Trans. Norfolk and Norwich Nat. Soc. 11:128-161, 1920-1921. 

 Cohn, Ferd., tJber die Funktion der Blasen von Aldrovanda und Utricularia. Cohns Bei- 



trage zur Biologie der Pllanzen i(3):7i-92, 1875. 

 CoMi'TON, R. H., The morphology and anatomy of Utricularia brachiata Oliver. New 



Phytologist 8:117-130, 1909. . 



Crouan Freres, Observations sur un mode particulier de propagation des Utricularia. 



Bull, de la Soc. bot. de France 5:27-29, 1858. 

 Curry, Dalferes P., Breeding of Anopheles mosquitoes among aquatic vegetation of 



Gatun Lake, accompanied by periodic long flights of A. albimanus Wied. Southern 



Med. Journ. 27:644-651, 1934. _ . ,, ^ r, j j . u 



Czaja, a. Th., Ein allseitig geschlossenes, selektivpermeables System. Ber. d. deutscn. 



bot. Gesellsch. 40:381-385, 1923. 



