CONTENTS. 



Faga 



Artificial pond with siphoid outlet for regulation of height of water 1027 



A siphoid outlet for hatching and rearing troughs 1029 



A suction apparatus for cleaning hatching and rearing troughs 1 030 



A cleaning device for ponds or aquaria 1032 



Oxygenation and vacuum-producing apparatus 1033 



Scraper for preparing fish food I034 



1026 



