RROCEEDINQS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES. 



Third Series. 

 Botany. Vol. I, No. 5. 



Some Observations on the Development 



of the Karyokinetic Spindle in 



the Pollen-Mother-Cells of 



Cobsea scandens Cav. 



BY 



Anstruther a. Lawson. 



With Four Plates. 



Issued November 77, 1898. 



SAN FRANCISCO: 



Published by the Academy. 



1898. 



