268 ROCHESTER ACADEilY OF SCIENCE. [Oct. II, 



\'^ariou3 members contributed notes of their summer experiences. 



Mr. J. G. D'Olier exhibited a fine collection of Indian relics 

 found near Wilson's Station, in Bloomfield, describing the locality in 

 which they were found, and stating that the land features had been little 

 changed by the processes of agriculture. 



Miss Beckwith showed a collection of dahlias, lilies, and nastur- 

 tiums, which illustrated how single flowers are changed into double 

 ones by cultivation, the stamens and pistils being in the process of 

 transformation into petals. 



Dr. S. a. Lattimore described Mt. Desert Island, on the coast 

 of Maine, where he spent his vacation, speaking of the geological 

 formations and natural beauties of the island. 



Dr. Charles H, Howard mentioned the appearance of a foreign 

 insect, Attica syntha, at Bridgewater, Conn. He said that it had 

 probably escaped from some one's collection, but that there was no 

 danger of its becoming harmful in this country. 



Mr. Baxter stated that the Russian Thistle was becoming abundant 

 on the river flats below the gas works, and that steps should be, taken 

 to eradicate it. 



Mr. C. J. Sarle spoke of some discoveries which he had made in 

 regard to Arthrophyciis Harlani, which go to show that these struc- 

 tures are plants' and not worm tracks, as some geologists have 

 thought. They are forked and the various branches may be traced to a 

 common base. They are also twisted, as seaweeds often are by the 

 wash of the waves. Fragments of them have been broken off, and 

 evidently washed around, and the surfaces are pitted. 



Mr. Sarle also thought the Spirophyton and allied forms found in 

 the Medina sandstone are not worm tracks, but fossil plants. 



Mr. J. M. Davison described a 



QUARTZ NODULE WITH RADIATE STRUCTURE. 



This nodule of quartz was found in the Laurentian gneiss at 

 Greenfield, Saratoga Co., N. Y. In this locality the gneiss has been 

 penetrated by veins of trap rock, with resultant metamorphic changes 

 in the character of the gneiss. The nodule was embedded in a chloritic 

 mass. Its color is greenish-white ; structure radiate ; hardness 6-7 ; 



