} 



22 



" The Botanical Gazette " In exchange. 



"Proceedings of the Hertfordshire Natural \ 



History Society" ) " " 



" Journal of the Royal Microscopical Society "... „ ,, 

 " Fifteenth Report of the South London 

 Natural History Society " ... 



Part VI. of Dr. Hudson's " Rotifera" Purchased. 



" Annals of Natural History " ... ... ... ,, 



The Secretary said that he had been requested to announce that the 

 Annual Soiree of the Croydon Microscopical Society would take place on 

 November 17th, and that forms were placed upon the table for the use of 

 any members of the Club who were desirous of responding to the invitation 

 to assist on the occasion. 



Mr. Spencer read a paper on Zoothamnium arbuscula, which he illustrated 

 by drawings on the black-board. 



The Chairman thought the communication was one of great interest, 

 although not relating to a branch of microscopy to which he had given any 

 personal attention. He hoped some other members would contribute fur- 

 ther information upon it. 



Professor Stewart said there was one point about the subject which 

 appeared of special interest, and that was as regarded the splitting up of 

 what was originally a membranous collar into individual cilia. He thought 

 if this was so. it would be an interesting question as regarded other infusoria 

 which were provided with a vibratile collar, and he should be very glad to 

 hear if any other observers present had noticed this process. 



Mr. J. D. Hardy regretted that he had not been able to reach the meeting 

 in time to hear the whole of the paper, but he could quite corroborate the 

 fact as to this splitting process. Whenever he had observed it, he had 

 always noticed that the fresh bell broke off, swam away and adhered by its 

 ciliary processes, and that what was originally the lower portion of the 

 animal formed the cilia in the new one. 



Mr. Spencer said that Mr. Hardy's observation probably referred to some 

 other species. He had never seen this himself, but might not have seen the 

 bodies attach themselves because his trough was too large. 



The thanks of the meeting were voted to Mr. Spencer for his paper. 



The Chairman said that some new objectives had been sent by Dr. Carl 

 Zeiss, of Jena, and called upon Mr. dirties to give some account of them. 



Mr. Curties said he was glad to embrace that early opportunity of exhi- 

 biting to the Club the new apochrornatic objectives and their eye-pieces 

 recently introduced by Dr. Zeiss, knowing, as he did, the lively interest shown 

 by the members in all matters relating to the use of, and improvements in, the 

 microscope. He thought it would be unnecessary for him to occupy time in 

 giving a detailed account of the apochromatics, as they were termed, as in the 

 last number of the "Journal of the Royal Microscopical Society" would be 

 found, through the kindness and by the aid of our Hon. Secretary, Mr. 

 Karop, a full translation of the descriptive pamphlet just issued by Dr. Zeiss, 



