TWENTY-FOURTH ANNUAL REPORT 141 
Harbor Water—Temperature and Specific Gravity 
Temperature. Specific Gravity. 
SAMUI EUV we Sik tae cea tas. Sheen ¢ 435° LOL 
J EEL OT ELD ESD A Jee tee ect ar 41° 1.014 
iiieCla. yeas eek raciners Shae: 43° 1.011 
JENS C1 611 WAS Rahat Ne eS See are Re ERE 45° 1.009 
IVER es Bee ee Pett < fs ae tees 3% 51° HOHE 
SILEIROW ean Pee oo eecac clic, 2 60° LOZ 
SUD aa ee sep ned atts ah RR 67° 1.014 
NVI US ae tterect aes wer gcaies otek sxe 68° 1.014 
SYS] OLS) 0011072) Oo eRaana a Ae a 68° 1.0138 
OX HC) OVE Pe rn en 64° 1.013 
INOVETND CEM 25x20 ks es, 57° 1 Odct 
Decembersy Sara02 ahs. kok 46° TOT 
Accessories.—In making shipments of fishes by train or 
otherwise, where a steam-driven air compressor is not available, 
the use of a hand air pump saves much labor. An air pump of 
the kind shown in the accompanying photograph has been added 
to the collecting equipment of the Aquarium. With branch pipes 
of rubber led to each tank, the work of aerating the water is 
simplified and made more effective. The end of each branch pipe 
is plugged with porous wood which liberates the air as a fine mist 
and not in large and ineffective bubbles. 
All exhibition tanks in an aquarium must be supplied with 
strainers of some sort in their top overflows and bottom drains, 
to prevent the escape of small fishes and the clogging of waste 
pipes with various substances. In salt water tanks where metal 
and wire strainers rust out quickly, their renewal involves consid- 
erable expense, while their rusting serves to discolor the supply 
of stored sea water. The use of strainers made of lead or rattan 
has obviated these troubles. Several types are shown in the ac- 
companying photograph. 
Appropriation.—The appropriation for the year 1919 was 
reduced to the legal minimum of $45,000. The appropriation for 
the ensuing year has been fixed at $54,891.30, but the increase 
will necessarily be devoted to the advancement of wages, and the 
Aquarium will probably be unable to make a number of needed 
repairs. 
Respectfully submitted, 
CHARLES HASKINS TOWNSEND, Director. 
