EIGHTH ANNUAL REPORT. ie 
The hatchery afforded a practical working exhibit of the proc- 
esses of modern fish culture and was of constant interest to visit- 
ors. School teachers visiting the Aquarium with their classes 
found it useful for biological instruction. It should doubtless be 
developed into a local school of fish culture, and can supply em- 
bryological material for advanced students in the universities. 
Arrangements have been completed for continuing the hatchery 
on the same basis during the coming year, and eggs of the Quin- 
nat Salmon of the Pacific Coast have already been placed in it. 
PHOTOGRAPH. H. V. LETKEMANN, 
ANGEL FISH. 
Rock-work in the Exbition Tanks.—During the past year 
nearly one-half of the exhibition tanks at the Aquarium have 
been lined with rock-work, in order to exhibit the specimens with 
more natural backgrounds. This treatment of the tanks has prov- 
en satisfactory, and is an improvement on the original lining of 
white tiles, which gave them a very monotonous appearance. 
A supply of coral rock was procured from the Bahama Islands, 
and an attempt has been made to give the tanks the appearance 
of grottoes like those occurring in the reefs about islands of coral 
formation, 
A number of very good sea caverns have thus been constructed, 
