125 
Fig. 13. Staurastrum aviculum, var. brevispinum, side view. 
Figs. r4 and 15. Staurastrum polymorphum, var. pentoganum. 
Figs. r6and 17. Staurastrum Sebaldi, var. guarternum. 
Fig. 18. Staurastrum arctiscon, var. crenulatum. 
Fig. 19. Spirogyra equals, sterile filament. 
Figs. 20 and 21. Spirogyra equalis, fertile filaments. 
Fig. 22. Staurastrum eustephanum, young encysted. 
Fig. 23. Xanthidium cristatum, var. truncatum, Harvey. No. 122, Art. IIL., 
Me. Algze, BULLETIN, Vol. XVI., p. 186. 
Figs. 24 and 25. uastrum verrucosum, var. simplex, Joshua. No. 46, Art. 
I., Me. Algze, BULLETIN, June, 1888, p. 160. 
Figs. 26 and 27. Staurastrum saxonicum, var. pentagonum, Harvey. No. 62, 
Art. I., Me. Algze, BULLETIN, June, 1888, p. 161. ” 
Sereno Watson. 
By WALTER DEANE. 
Systematic botany has sustained a most serious loss in the 
recent death of Dr. Sereno Watson, Curator of the Harvard Col- 
lege Herbarium. It is always with a feeling of deep sorrow that 
we record the death of a man who has made himself famous by 
his eminence in science, but far deeper is our loss when, to 
his scientific attainments is added the kindly spirit which prompts 
the scholar to aid and encourage those seeking his assistance. Such 
was Dr. Watson. Reserved and retiring by nature, he rather shrank 
from society, and preferred to devote himself almost entirely to his 
own labors. But it was in the herbarium especially that his gentle 
nature and his readiness to help those about him were shown. 
He was never too busy to stop and ask a friendly question or 
give a courteous answer. How many times has he paused in his 
own work to help unravel some knotty problem put before him! 
But, to the botanical world at large, he will always be known as a 
master of systematic botany. ‘ 
Dr. Watson was born at East Windsor Hill, Connecticut, 
December Ist, 1826. After graduating at Yale College in 1847, 
he taught school for six years in New England, Pennsylvania and 
New York, besides holding the position of tutor in lowa Univer- 
sity. A portion of this time he spent at East Windsor and at 
the University of New York in studying medicine. He con- 
‘nued his studies from 1853 to 1855, with his brother at Quincy, 
Illinois, where he practiced medicine for two years after. 
Though possessing a general interest in botany all this time, he 
