Biological Station 13 



portunity will be afforded college and high school teachers of botany 

 to collect material for use in their classes. Instruction in the preser- 

 vation of such material will be given to students desiring it. 



Tuesday and Thursday. Four hours credit. Dr. Holman. 



Prerequisite: An elementary collegiate course in botany, zoology 

 or biology or the equivalent. 



This course does not give credit to graduate students. 



104. Systematic Botany. — The chief aim of this course is to 

 acquaint the student with the flora about the Station and to give 

 him facility in the identification of plants by the Manual. About 

 one hundred species of plants are identified in the field, the char- 

 acteristics of the more important families of flowering plants are 

 learned, and the general principles of the classification of plants are 

 presented. There is excellent opportunity for the collection and prep- 

 aration of material for the herbarium. Students who complete this 

 course successfully should be able to identify readily the native flora 

 in any section of the country. 



Wednesday. Two hours credit. Dr. Ehlers. 



Prerequisite : Botany 102 at the station or a course in elementary 

 collegiate botany. Courses 102 and 104 may not be taken concur- 

 rently. 



This course gives one hour of credit to graduate students. Stu- 

 dents wishing two hours of graduate credit must perform additional 

 work and will register for Course 104^. 



106. Ecology. — This course serves as a general introduction to 

 ecological field work and the methods of ecological research, with 

 particular reference to the study of plant associations. Practice is 

 given in the recognition of associations, the determination and de- 

 scription of their structure and successful relations, and the measure- 

 ment of some environmental factors. Particular attention is given 

 to the dynamic factors of the environment, to their effect on the 

 present structure and future development of the plant community, 

 and to the role of the individual plant in promoting or retarding 

 these effects. Because of the large number of associations in the 

 region, it is impossible to study more than the most important ones. 

 These include the aspen association, the hardwood forest, the tama- 

 rack and sphagnum bog, the arbor-vitae bog, and the sand dunes, 

 lagoons, and beaches along the lake shore. 



Tuesday and Thursday. Four hours credit. Assistant Professor 

 Gates. 



Prerequisite: Elemental collegiate botany but it is recommend- 

 ed that the student have had systematic botany and plant anatomy. 



This course gives two hours credit to graduate students, who 

 mav receive fall credit by registration in Course 106a. 



