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PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 20th of June, 1906, at 20 Hanover Square, W., 

 Dr. D. H. Scott, F.R.S., etc., President, in the Chair. 



The Minutes of the Meeting of the 16th of May, 1906, were read 

 and confirmed, and were signed by the President. 



Mr. J. T. Holder exhibited and described an old Microscope made 

 by Andrew Pritchard for Mr. T. M. Ray in 1846, which had been lent 

 for exhibition by Mr. W. R. Reeves, of Liverpool. In addition to the 

 set of objectives and apparatus described by Mr. Holder in his paper, 

 there was a candle-holder fixed to one side, also invented by Pritchard. 



The thanks of the Meeting were voted to Mr. Holder for his paper, 

 and to Mr. Reeves for sending this Microscope for exhibition. 



Dr. Hebb read a letter which had been received from Mr. Dollman, 

 of Adelaide, Australia, with reference to his recent communication on 

 Stereoscopic Photomicrography. The letter stated that since writing his 

 paper, he had succeeded in making some photographs of objects under 

 high powers, examples of which were exhibited in the room. 



The thanks of the Meeting were voted to Mr. Dollman for his letter 

 and exhibit, and to Dr. Hebb for bringing them before the Meeting. 



Mr. Rheinberg-'s paper " On the Influence on Images of Gratings of 

 Phase Differences amongst their Spectra," was taken as read. 



Dr. D. H. Scott read a paper " On the Structure of some Carbon- 

 iferous Ferns." He began by pointing out the revolutionary change 

 which had taken place during the last three years in our conception of 

 the Carboniferous Ferns. Representatives of so many of the principal 

 Fern-like genera were now either known to have borne seeds, or were 

 under strong suspicion of the seed-bearing habit, that comparatively 

 few undoubted Ferns were left, and the question had even been 

 suggested whether, at least in the Lower Carboniferous, true Ferns existed. 

 The problem was of the utmost importance with reference both to the 

 history of the Ferns themselves and to the probable ancestry of the 

 Pteridosperms and Seed-plants generally. 



There was one family, the Botryopteridese, which was generally 



