Ann Arbor Scientific Association. 25 



Mr. J. D. Williams, of the Washtenaw County Pioneer Society, 

 was introduced, and exhibited a supposed Indian relic in the 

 form of a pipe-head with Egyptian peculiarities in features and 

 arrangement of the hair. It was found about ten years ago on 

 the surface of the ground at Boyden's Plains, eight miles from 

 the city of Ann Arbor. 



Dr. A. Sager gave the results of some " Observations of the 

 Development of some Dipterous Larvce" as drawn from his note- 

 book. On August 19, he found a group of some 15 or 20 jelly- 

 like ovoid bodies as large as a pea, attached to each other by a 

 common cord, on a small aquatic plant, which, when micro- 

 scopically examined, were found to be composed of microscopic 

 ova, invested with a glairy mucus, each mass containing from 

 2,000 to 3,000 eggs, curiously arranged in rows, the ova of each 

 row being differently disposed. The enclosed embryos were 

 distinctly visible through the transparent membranes. The em- 

 bryos were so far developed as to exhibit the abdominal segments 

 distinctly. Nearly in the center of the body was seen a dark, 

 anteriorly bifurcate mass, which was composed of minute spheri- 

 cal granules or probably cells, but not very distinct. There 

 were twelve segments apparently, of the body, and the extrem- 

 ity terminated with a pair of pincers. October i4th. The viscera 

 were now fully developed, the chain of nerve-ganglia, chiefly in 

 pairs, the alimentary "canal, the dorsal vessel and the respiratory 

 tubes distinctly visible. The action of the dorsal vessel was 

 beautifully exhibited. The structure exhibited this peculiarity, 

 that instead of the usual form of valves, there were distinctly 

 seen at short intervals, on the surface, opposite to each other, two 

 or four small tubercles that completely closed the canal when in 

 action, for an instant. The intestines were furnished with four 

 long coveca, two ascending and two descending. The air vessels 

 terminated in bifurcating processes on the last segment of the 

 abdomen. 



Prof. Harrington reported that Miss C. A. Sager and him- 

 self had examined some twenty samples of tea obtained froir 



