53 



PROCEEDINGS. 



March 22nd, 1872. — Chairman — Dr. John Matthews. 



The following donations to tlie Club were announced : — • 



" The Monthly Microscopical Journal " from the Publisher. 



" Science Gossip " ,, 



"The Lena" \ the State Microscopical 



' Society of Illinois. 



*' The American Naturalist " in exchange. 



" The Journal of the Loudon Institution " ...from the Librarian. 

 " The Annual Eeport and Proceedings of the ) ... 



^ Geologists' Association" J the Association. 



* ' The Proceedings of the Literary and Philo- \ -u a ■ 



sophical Society of Manchester " ... * the Society. 



" The 22ud Annual Eeport of the Bank of) ,, ^ ^ „ 



England Library" 1 Mr. Suffolk. 



" Conspectus of Diatomacese," extracted from ) Professor Hamilton Smith. 



" The Lens," 4 Nos j 



The thanks of the Club were unanimously voted to the donors. 



The following gentlemen were balloted for and duly elected members of the 

 Club:— Mr. George Daintrey, Mr. Joseph Guyton, Mr. Ernest D. Marquand, 

 Mr. R. H. Pinker, Mr. C. S. Rolfe, Mr. Harry Smurt. 



A Paper by Dr. G. W.Royston Pigott, ''On a New Method of Ascertaining the 

 Magnifying Power of Objectives," was communicated to the meeting by the 

 Secretary. 



The Chairman said there could hardly be a more fertile subject for discussion 

 than that which was the subject of this papc'-, neither was it possible to over- 

 rate its importance, seeing that accuracy of measurement lay at the very foun- 

 dation of microscopical investigation. He had himself found very little difficulty 

 in ascertaining the magnifying power of any objective by means of a little con- 

 trivance of his own— the calliper eye-piece — which was introduced to the notice 

 of the Club soon after he had first brought it out, and the use of which he ex- 

 plained at the time. He felt sure that all the members would join most cordially 

 in presenting a vote of thanks to Dr. Pigott for his paper, especially as they 

 would have the privilege of reading it in extetuo when printed in the Journal. 



The Secretary, in seconding a vote of thanks to Dr. Pigott, drew the atten- 

 tion of the members to the simple method of ascertaining the magnifying power 

 of objectives mentioned by Dr. Beale in his book on the microscope. 



A vote of thanks to Dr. Pigott for his paper was then put to the meeting and 

 carried unanimously. 



