131 



Mr. James Burton read a note on "Two Instances of ' Break- 

 ing of the Meres.' " 



Some discussion followed, in which the Hon. Secretary and 

 Messrs. Paulson, Offord, Pearson, and P. Inwards took part, and 

 to which Mr. Burton replied. 



Mr. Burton also called attention to an organism found in a 

 collection made during the excursion of the Club on the previous 

 Saturday, mostly on the rootlets of duckweed, but also on the 

 submerged leaves of the water ranunculus. The description was 

 aided by drawings on the board showing how the first form broke 

 up into eight gonidia, and subsequently again produced eight 

 more, forming a very pretty object under the microscope. It was 

 understood to be Sciadium Arhuscula. 



At the meeting of the Club held at the Morley Hall, George 

 Street, Hanover Square, W., on May 24th, 1910, Prof. E. A. 

 Minchin, M.A., F.Z.S., President, in the chair, the minutes of the 

 meeting held on April 26th were read and confirmed. 



Messrs. James Grundy, Charles Taylor, William N. Allen,. 

 Henry J. Troughton, F. G. Carruthers and E, G. Brown were 

 balloted for and duly elected members of the Club. 



The list of donations to the Club was read and the thanks of 

 the members were voted to the donors. 



The Hon. Secretary (Mr. W. B. Stokes) read a note on, and 

 exhibited a specimen of, a micrometer designed in 1878 by 

 Professor Burch, of Enfield College. He said it consisted of a 

 short length of tube fitting over the eye-piece. This tube is cut 

 at an angle of 45 degrees to the optical axis, and across this is 

 placed a piece of plate-glass silvered on the outside. This has at 

 its centre a perforation smaller than the diameter of the pupil of 

 the eye in this respect similar, but prior, to Abbe's drawing 

 apparatus. A rod is attached at right angles to the fitting. 

 ISliding on this rod, and at right angles to it, is a scale which may 

 be divided to any convenient number of small divisions. The 

 instrument exhibited had an ivory scale 15 cm. long, divided to 

 millimetres. In use, a stage micrometer is placed on the micro- 

 scope stage. The eye, placed close to the perforation in the 

 silvered mirror, observes the divisions of the stage micrometer 

 superimposed on the divisions of the sliding scale referred to. 



