12 Biological Station 



and laboratory work, especial attention being given to the lake itself. 

 This involves the collection and identification of animals, the deter- 

 mination of life histories, the study of structural and physiological 

 adaptations, and an analysis of the environmental factors, organic 

 and inorganic, which are operative in each complex. Interdependen- 

 cies and the dynamic relations existing in the selected habitats are 

 stressed. In general, only those forms which are important in pre- 

 senting the facts and principles of ecology are considered in detail. 

 Dissolved gases are determined and their biological significance care- 

 fully considered. Students have actual experience in the use of meth- 

 ods and equipment employed in the consideration of temperature, 

 depth, transparency, qualitative and quantitative aspects of plankton 

 work, and lake bottom faunas. A series of lectures dealing with the 

 more general, fundamental principles of limnology supplement the 

 field and laboratory work. 



The course is planned for prospective teachers of biology as well 

 as for those who plan to become professional zoologists. 



Wednesday and Friday. Four hours credit. Assistant Professor 

 Welch. 



Prerequisite : Elementary collegiate zoology. 



This course gives two hours credit to graduates, who may secure 

 full credit by registration in Course 103a. 



105. The Natural History of Insects. — This course is intended 

 to give the student a general acquaintance with the insects of the 

 region and to afford opportunity for the study of the various forms 

 in their native habitats. Field studies are made of the life histories, 

 habits, and activities of insects belonging to various orders. Em- 

 phasis is placed upon the relation of insects to their environment, and 

 upon economic relations. Some work on the morphology and physiol- 

 ogy of insects is included. Instruction is given in the approved meth- 

 ods of collecting and preserving insects in all stages of development. 

 Opportunity is afforded to form individual collections of properly 

 determined specimens. 



Monday. Two hours credit. Dr. Stoner. 



Prerequisite : Elementary collegiate zoology. 



This course gives one hour credit to graduates. Students de- 

 siring full credit must complete extra work, and will register for 

 Course 105^. 



107. Ornithology. — In this course, birds are studied mostly dur- 

 ing their breeding season, but in the latter part of the session, there 

 are opportunities for studying early autumnal migration movements. 

 Special attention is given to identification of birds and methods of 

 field study. Bird behavior and especially nesting habits are consid- 

 ered. Lantern slides are used in studying identification characteris- 

 tics and for illustrating bird behavior. The bird fauna is ample for 

 the course, and it is interesting especially because of the northern 

 species breeding here under wild conditions. There are conferences 

 at which various ornithological topics are discussed. 



