148 



he made 40 years ago, and also some of Frofessor Moseley's preparations 

 showing the nerve trunks passing along to the eyes, which looked almost 

 like pears upon their foot-stalks. It had long been an idea amongst 

 naturalists that the Chiton, on account of its peculiarities, had some relation 

 to the Articulata ; and in this discovery there occurred another curious 

 point of analogy. The plates in illustration of Professor Moseley's paper 

 would be printed in the next number of the " Quarterly Journal of Micro- 

 scopical Science." 



Mr. E. M. Nelson said he wished to bring a small " brass and glass " 

 matter before the notice of the meeting, and that was a stop for an Abbe 

 Achromatic Condenser. It gave 1*25 numerical aperture, or 1*3 with a 

 Powell Condenser. He was exhibiting it that evening, and the results 

 were most satisfactory. The highest resolving power, he found, was ob- 

 tained just before the field began to get dark. 



Another matter he wished to notice, was the fact that the cholera bacillus 

 was found to be a beaded structure, the same as observed in the case of 

 the tubercle bacillus. Mr. Watson Cheyne had found this to be so, and he 

 (Mr. Nelson) had also carefully examined it with the dark ground illumina- 

 tion and found it to be most remarkably distinct. 



The President said that finding that Nachet's small Portable Microscope 

 had not been exhibited at the Club, he had brought it down to the meeting, 

 and would exhibit his specimens under it. He then exhibited and described 

 the instrument, showing the method of setting it up and of changing the 

 compound body for the simple arm for dissecting purposes, and also the 

 method adopted for quickly changing the objectives. 



Announcements of meetings, &c.,for the ensuing month were then made, 

 and the proceedings terminated with the usual conversazione, and the follow- 

 ing objects were exhibited, in addition to those shown by the President : — 



Condylostoma patens Mr. F. W. Andrew. 



Spine of Skate Mr. W. M. Holmes. 



Pollen, Lilium longifolium ... Mr. G. E. Mainland. 



Section of Shell of Haliotis Mr. C. Le Pelley. 



Diatoms from Campeachy Bay ... Mr. W. Watson. 



A new Condenser Dr. Wallich. 



Attendance — Members, 60 ; Visitors, 5. 



February 13th, 1885. — Conversational Meeting. 



The third demonstration of the series was given by Dr. M. C. Cooke, 

 M.A., A.L.S., &c, the subject being, " Collecting, Examining, and Preserv- 

 ing Fresh Water Algse." 



Dr. Cooke premised that he should group his observations and illustra- 

 tions under seven heads, in order to facilitate their impression upon the 

 memory. 



I. Definition. — " Fresh Water Algae " was a purely artificial arrangement 

 made solely for the convenience of those who desired to study the inland to 

 the exclusion of Marine Alga?. This group was held to include such as were 

 found in fresh and brackish water, as well as those inhabiting the face of 



