No. 444-] 



OUT-DOOR EQL 1 I'M EX T. 



>73 



into the net and out through the overflow pipe q. The rate of 

 flow is readily measured at the end of the overflow pipe q. The 

 net is placed for use on a platform at the foot of the dam that 

 confines the campus pond and the water is brought to it by 

 siphoning over the dam with a long garden hose. The upper 

 end of the hose is fitted with a funnel-shaped, screen covered 

 intake, and this can be held in am position and at any depth as 

 long as desired. The flow is perfectly uniform, even such 

 active and light loving forms as Corethra and Corixa being 

 readily taken down the pipe. This simple apparatus has made 

 itself an indispensable adjunct to the work of several courses. 

 Its use at once revealed the presence of vast numbers of Din- 

 obryon, Notholca, Polyarthra, etc., not previously known to 

 exist in the pond. 



Near to the plankton platform in the ravine is the winter 

 house, in which are kept the plankton and other field apparatus 

 and garden tools. Here are proper quarters also, for live ani- 

 mals desired for study during the winter : tanks in the floor for 

 salamanders, frogs, crayfishes, earthworms; shorts-bins on the 



etc. This most useful little house, shown in the third figure 

 of the plate, was built to fit the landscape and not to disfigure it. 

 Individual apparatus tor field work is much more simple. 



trowels, etc.. are supplied every student ; for field work at Lake 



definite results are expected from it. How much less expensive 

 is this out door equipment than the indoor equipment that all 

 the colleges have ! 



But the first requisite of satisfactory field work on the part of 



