T274 Wisconsin Academy of Sciences , Arts , and Letters. 
ing from about 10° to 30° or even higher, so that the range of 
temperature is practically from alpine to tropical. 
Between the Seehof and Lunzersee, along the stream which 
flows down from the lakes above, there are a few large ponds and 
some cement pools in which fish-breeding experiments are car¬ 
ried on. 
The three lakes which lie within the station’s domain repre¬ 
sent very different physical and biological conditions. The 
IJntersee or Lunzersee on which the laboratory is located, is the 
largest. It is about 1,600 m. long, from 200 to 600 m. broad, 
and has a maximum depth of 34 m. Its altitude is 617 m. 
^Further up the valley is the Mittersee, less than a quarter as 
large as the Untersee and having a maximum depth of only 4 m. 
It is fed largely by springs. Still further up the valley, at an 
altitude of 1,177 m., lies the Obersee. It is about 700 m. long, 
300 m. broad, and has a maximum depth of 15 m. There is an 
abundant snowfall at this altitude in winter and the lake is 
covered with ice for several months each year, so that rather 
severe alpine conditions are found here. Also many small 
ponds and pools are found in this mountain valley and the sur¬ 
rounding country. 
The beautiful and interesting mountain scenery and the well 
equipped laboratories make this an unusually good and attractive 
place for summer biological work. Tables in the laboratory as 
well as living rooms in the Seehof are gratis. Dr. H. Kupel- 
wieser is the present director of the station. 
The Bohemian Portable Laboratory was founded by Dr. 
Fritsch, its present director, in 1888. For some time after irs 
establishment, this station was used for conducting investiga¬ 
tions on some Bohemian lakes and lakelets. Then it was trans¬ 
ferred to the Elbe river and has since been used as a base for 
making physical, chemical, and biological investigations on the 
Bohemian portion of this stream and its backwaters. The work 
is still being carried on at all seasons of the year, but chiefly, of 
course, in the summer. Several publications resulting from 
investigations pursued at this laboratory constitute most valu¬ 
able contributions to the aquatic biology of Bohemia. 
There is no permanent biological station on lake Balaton, but 
