65 



XX. — Professor James Thomson, LL.D., offers a Prize of 

 jQi is. for the best Essay and Oral Answering on the 

 Optics of the Microscope. In event of there being 

 not less than three Competitors of sufficient merit, a 

 Second Prize of ios. 6d. will be also given. The 

 Oral Examinations will not be severe, and will not 

 require answering on any difficult questions outside 

 the scope of the Candidate's own Essay. — Further 

 details of the conditions under which this Prize is 

 offered will be found in the Report for 1869-70. 

 The Essays to be given in to the Secretaries on or 

 before the 17th March, 1873. 

 XXI. — Mr. J. W. Murphy offers a Prize of 10s. for the best 

 Collection of Recent Sponges — the conditions being 

 the same as those for Prizes I. to XVII. 



17 FEB 1 



