228 PEOCEEDINGS OF THE SOCIETY. 



Mr. Nelson Lad added one more to the many services which he had 

 rendered to practical Microscopy. 



The thanks of tho Society were cordially voted to Mr. Nelson for 

 his communication. 



Mr. H. G. Madan's paper, 'On a Method of Increasing the Stability 

 of Quinodine for Microscopical Purposes,' was read by Mr. Nelson, in 

 the absence of the author. 



Mr. Karop said it would be of great assistance to diatom-mounters 

 if Mr. Madan's method should prove to be effective. Quinodine was, 

 of all media, the best on the whole yet discovered for the purpose, but 

 it had hitherto been very troublesome on account of its tendency to 

 crystallisation. His own specimens had all gone wrong in that way, 

 and though he had tried re-heating and other means, they all became 

 crystallised again after a short time, and thus rendered useless. He 

 hoped the material prepared as Mr. Madan suggested would be 

 marketed, when he should be glad to give it a trial. 



On the motion of the Chairman, a vote of thanks was unanimously 

 voted to Mr. Madan for his paper, and to Mr. Nelson for reading it. 



The Hon. Thos. Kirkman's paper, ' On Some of the Eotifera of 

 Natal,' was read by Mr. Eousselet, and illustrated by specimens ex- 

 hibited under Microscopes in the room. 



Mr. Eousselet had himself added to this a technical description 

 of Pterodina trilobata, an excellent drawing of which, by Mr. Dixon- 

 Nuttal, was exhibited at the Meeting. 



The thanks of the Society were unanimously voted to Mr. Kirkman 

 for his paper, and to Mr. Eousselet for reading it. 



Mr. W. H. Merrett read a paper ' On the Metallography of Iron 

 and Steel,' demonstrating the subject by the exhibition of a large 

 number of lantern slides of sections of different classes of these metals 

 under various conditions of hardness, strain, &c. The methods by which 

 these sections had been prepared and polished were also explained. 



The Chairman said it was almost superfluous to ask the Fellows 

 present to return their thanks to Mr. Merrett. He had given them a 

 most excellent demonstration of a very important subject, in which 

 scientific research and commercial interests worked hand in hand. 



The thanks of the Meeting were voted to Mr. Merrett by acclamation. 



The Chairman said they had been indebted to Messrs. Baker for 

 having kindly provided and worked the lantern by which the slides 

 had been shown, their own lantern having been found unsuitable. 



The thanks of the Society were accordingly voted to Messrs. Baker. 



The following Instruments, Objects, &c, were exhibited:— 

 The Society :— An Old Microscope, by Carpenter. The following 

 Slides of mounted Eotifers, prepared by the Hon. Thos. Kirkinan, 

 of Natal, to illustrate his paper : Cyrtonia tuba, Pterodina trilobata, 

 Scaridium eudactylotum. 



Messrs. A. E. iStaley and Co. : — A Bausch and Lomb Camera Lucida. 



