544 The Ohio Naturalist. [Vol.IX, No. 8, 



Fig. 11. Thicker spirem with loops becoming more definite. 



Fig. 12. vSpirem adjusting itself into approximately S loops. 



Fig. 13. Loops more condensed than in Fig. 12. 



Fig. 14. The 8 loops distinctly formed. 



Fig. 15. Nucleus showing details of two loops. 



Fig. 16. Microsporocyte after separation of the loops, before much 



contraction has taken place. 

 Fig. 17. Further contraction of chromosomes; connecting threads present. 

 Fig. 18. Chromosomes beginning to show individuality before complete 



condensation has taken place. 

 Figs. 18a, b, c. Types of chromosomes as arranged on spindle. 

 Figs. 19-22. Chromosome groups showing individual shapes; two large 



twisted ones, two small ones, and two of medium size, one of 



which is heart-shaped, also two large ones with no definite 



shape. 

 Fig. 23. The chromosomes drawn into the equatorial plane. 



Meeting of the Biological Club. 



Chemistry Lecture Room, March 1, 1909. 



At the regular March meeting of the club, a special program 

 in commemoration of the centenary of the birth of Chas. Darwin 

 was presented. About 200 faculty members and teachers of 

 science in the Columbus and neighboring schools, responded to 

 the printed invitations which were distributed to the members 

 of the club and others. President W. O. Thompson, honorary 

 chairman, not being able to be present, the chair was occupied 

 by Miss Freda Detmers, president of the club. The program 

 was an attempt to cover briefly the many phases of the activity 

 of Darwin in his long and useful life devoted to science. 



The following subjects were presented: 



1. Darwin's Character and Method of Work, 



J'rofessor F. L. Landacre 



2. The Influence of Darwin's Work in Geology, 



Professor G. D. Hubbard 



3. Darwin's Contributions to Zoological Science, 



Professor Herbert Osborn 



4. Darwin in His Relationship to British Stockmen, 



Professor C. S. Plumb 



5. Darwin's Contributions to Horticultural Science, 



Professor V. H. Davis 



6. The Work of Darwin in Physiological Botany, 



Professor A. Dachnowski 



7. Darwin's Contributions to Botany, Professor J. H. Schaffner 



8. Darwin and Modern Philosophy, Professor A. E. Davies 



9. Darwin and Modern Psychology, Professor D. R. Major 



No business session was held, the entire evening being given 

 over to the reading of the papers. 



Arthur H. McCr.w, Secretary. 



Date of Publication. June 2, 1909. 



