The Microscope. 



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Vol. VIII. DETROIT, DECEMBER, 1888. No. 12 



ORIGINAL COMMUNICATIONS. 



ON THE DEVELOPMENT AND A SUPPOSED NEW METHOD 



OF REPRODUCTION IN THE SUN ANIMALCULE 



ACTINOSPH^RIUM EICHHORNIL* 



JOHN M. STEDMAN, B. S. 



T7 ARLY in March my attention was called to an aquarium which 

 -■-^ had been standing in my window during the winter, and 

 which contained anacharas and algpe in great abundance, but which 

 now suddenly presented a quantity of light pink substance on the 

 sides of the jar. It was the appearance of this pink colored mate- 

 rial among the debris of decaying and growing algse that attracted 

 my attention. Accordingly, a small piece of the substance was 

 spread out on. a slide and examined, when, to my surprise, it was 

 found to l^.composed of sun- animalcules of various sizes, among 

 which were other bodies, the true nature of which I did not at first 

 quite understand, but which, on close examination, proved to be the 

 young of the larger heliazoa. So numerous, indeed, were the young 

 heliazoa, that not a single field of the one-fifth objective and a 

 ocular could be chosen in which there were less than half a dozen, 

 and usually the number was very much greater. 



Such an unusually great and rare opportunity to study these 

 animals could not be neglected. 



Fortunately, they were discovered in the morning, and by close 

 and constant observation for several hours their true relations to the 

 numerous small bodies were satisfactorily demonstrated and proven 

 to be different stages of the same animal. 



* Transactions American Society of Microscopists, 1888. 



