70 Fresh-water Biology 



Study 5 

 A LAKE 



Work program: 



1. An examination of the more available ph^-sical features of a lake. 



2. Assembling from maps, charts, etc., such data as may be available concerning it. 



3. Reading Life of Inland Waters, pp. 59 to 76. 



For Record include: 



1. A map of the lake with bottom contours.* 



2. Detail map of any small part of it selected for special study. 



3. A profile diagram of it, cross-lined at regular temperature intervals (mid-summer 



records being available) to show thermocline. 



4. A description of the portion examined in detail, with notes arranged under the 



following headings: 



A. Areas examined: form, depth, embayments, affluents, etc. 



B. Water: transparency, temperature, chemical character, etc. 



C. Shore line: elevation, percentage eroding, aggrading, etc. 



D. Bed: percentage of area covered with emergent and floating plants, submerged 



weed beds, with algae, or bare. 



5. Miscellaneous: 



(a) Pollution, sources, nature. 



(b) Other artificial alterations, constructions, plantings, etc. 



Study 6 

 A MARSH 



Work Program: 



1. An examination of the physical features of a marsh. 



(a) By inspecting the vegetation. 



(b) By sampling the water. 



(c) By probing the bottom with a marl sampler. 



2. A study of such topographic and other maps are are available. 



3. Reading in the Life of Inland Waters, pp. 89 to 97, 



• Unless already done under Study I. 



