270 PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 17th op March, 1909, at 20 Hanover Square, W., 

 E. J. Spitta, Esq., M.R.C.S., etc., Vice-President, in the Chair. 



The Minutes of the Meeting of February 17, 1909, were read and 

 confirmed, and were signed by the Chairman. 



The List of Donations to the Society since the last Meeting (exclu- 

 sive of exchanges and reprints) was read as follows : — 



From 

 Stanislav-Hlava, Monographie der Familie Melicertidse. Arch. J 

 fur die Naturw. Landes. forsch. von Bohmen, xiii. No. 2. > Sir Frank Crisp. 

 (8vo, Prag, 1908) ) 



Charles Janet, Anatomie du Corselet et Histolyse des Muscles I 



Vibrateurs, apres le Vol Nuptial, chez la Reine de la Fourmi> The Author. 

 (Lasitcs niger). Text and plates. (8vo, Limoges, 1907) . . ) 



Leon Fredericq et Jean Messart, Notice sur Leo Errera. (8vo,^ 

 Bruxelles, 1908) 



Recueil d'CEuvres de Led Errera. Botanique Generale. 2 vol. 

 (8vo, Bruxelles, 1908, 1909) 



Recueil d'CEuvres de Leo Errera. Melanges, Vers et Prose. I 

 (8vo, Bruxelles, 1908) ) 



A New J^-in. Oil-immersion Objective Mr. E. Leitz. 



The thauks of the Society were unanimously voted to the Donors, 

 especially to Messrs. Leitz for the T V m - objective. 



A vote of thanks was also passed to Mr. C. L. Curties for the loan of 

 a number of Microscopes under which objects in illustration of the papers 

 were exhibited in the room. 



Madame Errera. 



The Chairman said that Mr. Leitz had sent him one of the new 

 T V-in. objectives for examination, and he had subjected it to some very 

 severe tests, but found it to be a very excellent lens. The corrections 

 were carried out in quite a different manner from the usual formula, and 

 he had written to Mr. Leitz saying that he very warmly congratulated 

 him upon the excellence of what he had produced. 



Mr. C. Lees Curties exhibited C. Baker's New Model D.P.H. Micro- 

 scope, two forms of which were shown : one having the mechanical stage 

 built on to the instrument, and the other with plane square stage. The 

 limb is cast in one piece, and has an opening in which the fingers can 

 be placed when lifting. The fine-adjnstment is worked by milled heads 

 at either side of the limb. These instruments are provided with either 

 a rackwork centring substage, plane rack substage, or screw focusing 

 substage. A third instrument, similar to the others but of smaller size, 

 with the fine-adjustment actuated by one milled head only, was also 

 shown. 



The Chairman said the handle seemed just now to be infecting all 

 the makers, and he was sure that anyone who had to carry a Micro- 

 scope about without such a handle must find it particularly painful to 



