peoceedings of societies. 41 



Erroks in a Cincinnati Letter in last Volume. 



To the Editor of the ' Monthly Microscopical Journal.'' 



Cincinnati, Ohio, U.S., May 21th, 1873. 

 Editor ' M. M. J.,' — Owing perhaps to a well-nigli illegible cliiro- 

 grajjliy, the following corrections are necessary in my letter, p. 239. 



P. 239, line 6, for " |th " read " J^th " ; p. 240, line 10, for " cone " 

 read '" fine " ; line 21, for " cone " read " cover " ; line 27, for " when " 

 read " where." 



Eespectfully, 



Tyeo. 



PEOCEEDINGS OF SOCIETIES. 



EoYAL Microscopical Society. 



King's College, June 4, 1873. 



Charles Brooke, Esq., F.R.S., President, in the chair. 



The minutes of the j)receding meeting were read and confirmed. 



A list of donations to the Society was read, and the thanks of the 

 meeting were voted to the donors. 



The President called attention to a list of names suspended in the 

 room in accordance with the by-laws, and expressed a hoi)e that if 

 any of the Fellows present were acquainted with either of the gentle- 

 men named in the list, they would kindly use their influence to endea- 

 vour to get the arrears of subscription paid up, so that the names 

 might not be struck out from the general list of Fellows. 



The Secretary read a paper by Mr. F. Kitton, of Norwich, descrip- 

 tive of some species of Aulacodiscus, and other diatoms found at 

 Iquique, Callao, &c., by Capt. Perry of Liverpool. The pajier — 

 which was illustrated by drawings, and by specimens exhibited at the 

 close of the meeting — will be found printed in extenso at page 6. 



The thanks of the Society were imanimously voted to Mr. Kitton 

 for his paper. 



Mr. J. W. Stej)henson said he took the present opportunity of 

 stating that, to his surprise, he found that the mode of dividing the 

 cone of light in his erecting binocular microscope by means of two 

 prisms was used by Professor Eiddell, of New Orleans, in the year 

 1858, in his form of binocular. The arrangement of that instru- 

 ment differed from his own in the following respect— t'/z. that his 

 (Mr. Stephenson's) prisms were so placed that, combined with the 

 reflecting plate above, they acted as an erecting instrument, and by 

 entering into the cell of the object-glass could be used for high 

 powers whenever required ; whilst those of Professor Eiddell were 

 placed above the object-glass simj^ly to produce binocular efiect. He 

 had only just heard of this through the kindness of Mr, Frank Crisp, 

 and he took the earliest opportunity of notifying it to the Fellows of 

 the Society. 



