164 
Aquatte Lite 
“Oceanic Ichthyology” (1894). Associ- 
ated with him, in the latter work, was 
Dr. Tarleton H. Bean, to whom refer- 
ence was made above. 
In my private collection of the por- 
traits of naturalists, I find unpublished 
photographs of both Professor Baird and 
Doctor Goode, personally presented to 
me. ‘These were copied for me at the 
photographic gallery of the Army Med1- 
cal Museum and Library, and reproduc- 
tions of them illustrate the present pa- 
pers. Many naturalists now living will 
delight in possessing these portraits ; and, 
as a matter of fact, few American zoolo- 
gists of the last decade were more uni- 
versally loved and esteemed than these 
Fortu- 
nately, their researches were carried on 
in an age when all the departments of 
American biology were at the acme of 
their development, and naturalists of the 
very highest order were producing works 
of the greatest possible importance. But 
now the world is in the throes of a 
mighty and most destructive war, and 
zoological science has, as a consequence, 
suffered enormously—in some ways irre- 
trievably. 
two most eminent scientists. 
One can well imagine what 
intense pain either of these men would 
have experienced, had they lived to see 
the felling of the magnificent and long- 
revered beeches, oaks and other grand 
trees close to the National Museum on 
the Mall—all of which was accomplished 
in a few hours as one of the military 
necessities of this war, to say not a word 
of the trees sacrificed in the park north 
of the Bureau of Fisheries, a department 
with which both Baird and Goode were 
so thoroughly identified. Indeed, Pro- 
fessor Baird was our first Commissioner 
of Fish and Fisheries (1871), and was, it 
may be said, the Nestor of that important 
industry. 
Krefftius adspersus 
Under present shipping conditions it 
may seem a far cry to talk of fishes of 
Australia, but the seemingly impossible 
has been accomplished. A few speci- 
mens of the Purple-striped Gudgeon have 
been safely transported to the United 
States. Incidental thereto we have re- 
ceived a splendid photograph of the fish, 
taken by Mr. H. E. Finckh, of the Royal 
Zoological Society of New South Wales, 
which is reproduced in this issue. ‘This 
is apparently the first published photo- 
graph. 
Mr. Finckh observes that the fish is a 
most considerate inhabitant of the aqua- 
rium. In his tanks the eggs were always 
placed on the front or room-side of the 
tank, making a close study of their de- 
velopment very easy. In a nest contain- 
ing some two hundred eggs, all the fry 
were coiled round in the same direction, 
head down, and were thus on the eighth 
day atg A. M. and at noon. At 4 P. M. 
all, with a single exception, had turned 
head up. The next day the eggs hatched. 
The fish gets its common name from 
the four purple stripes on the gill-covers. 
The body is marked with blue and brown, 
becoming more pronounced during breed- 
ing. The yellowish fins are plentifully 
bespeckled with the body colors. If this 
gudgeon proves well-behaved and _ suit- 
able for the community tank, its future 
in America is assured, especially as it 
breeds readily and does not require a 
high winter temperature. 
— +>. 
Carbon dioxide is the most important 
gas in freshwater. In small quantities it 
is essential rather than detrimental to 
aquatic animals. In large quantities it is 
rapidly fatal, acting as a narcotic. It is 
particularly injurious in the absence of 
oxygen, which absence is usually associ- 
