16 Biological Station 



ervation of material for use in teaching or in research. The topics- 

 chiefly considered are the anatomy and secondary thickening of the 

 stem and the structure of the root and the foliage leaf. The modifi- 

 cations of the structure of the leaf in different environments will be 

 considered. 



Monday. Two hours credit. Dr. Ehlers and Professor Gleason. 



Prerequisite'. Elementary collegiate botany. 



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 loSa. 



no. Advanced Systematic Botany. — In the field the student 

 w T ill have practice in the identification and recognition of plants be- 

 longing to the more difficult groups, including grasses, sedges, pond- 

 weeds, and others, and in the identification of plants from fruit or 

 leaf characters only. The characteristics of these families will be 

 presented both in the field and by lecture. The lectures will also 

 consider the evolution and relationships of the angiosperms, the rules- 

 of botanical nomenclature, and the present trend of systematic botany, 



Thursday. Tzvo hours credit. Dr. Ehlers. 



Prerequisite : Botany 104 at the Station or Botany 8 at the 

 University, or equivalent preparation elsewhere. 



This course gives full credit to graduate students. 



112. Special and Research Work in Botany. — Students who have 

 taken Courses 104 or 106 or have had adequate botanical experience 

 elsewhere, will find at the Biological Station excellent opportunities 

 for further study or research in many lines of botany. Undergrad- 

 uates, or graduates beginning research and consequently needing per- 

 sonal direction, are advised to choose a problem along ecological, ana- 

 tomical, or systematic lines. Advanced students or independent in- 

 vestigators are free to choose problems in any line of botany, and 

 every effort is made to provide them with the necessary facilities and 

 equipment for their work. 



Days to be arranged. Two, four, six, or eight hours credit. 

 Professor Gleason, Assistant Professor Gates and Dr. Ehlers. 



Prerequisite-. Admission only by arrangement with the instruc- 

 tors in charge. 



This course gives full credit to graduate students. 









Entered as Second-Class Matter at the Postoffice at .Ann ^Affbor, 



Michigan. iff 



THE ANN ARBOR PRESS 



