550 Wisconsin Academy of Sciences, Arts, and Letters. 
V. Water Sampler for Bacteria (Text fig. 6) 
This instrument is modified from one described in 1892 by Dr. 
H. L. Russell, as used by him for work in the Mediterranean Sea. 
It has received more than one modification in the course of the 
Fig. 6. Water sampler for bacteria. A, Messenger. B, Line. C' lf C 2 , 
Movable jaw. D, Spring clamp for holding sample tube. E, Break¬ 
ing pin. 
work of this Survey. Its latest form is that devised by Mr. Frank 
C. Wilson and fully described by him in the Journal of Bacteri¬ 
ology, vol. 5, pp. 103-108 (1920). This article also gives reference 
to the papers which describe other forms of water samplers for 
bacteriological purposes. 
