PROCEEDINGS OF THE SOCIETY. - 149 



enlarged copies of the illustrations were drawn upon the board (see 

 p. 1). The latter Dr. Hudson described in a separate letter as a 

 " great prize," being a perfectly new Floscule, with only three lobes, 

 and much larger than any of the known species ; and the former as 

 being most interesting from its trochal disk, being, as it were, a link 

 between that of Melicerta and that of CEcistes. 



Mr. Crisp read a letter from Mr. John Hood, of Dundee, the dis- 

 coverer of the animals, stating that in consequence of continued bad 

 weather he had been prevented from securing the specimens which he 

 had hoped to send for exhibition at the meeting. 



Mr. Ingpen said he had the pleasure of seeing the specimens de- 

 scribed by Dr. Hudson, as Mr. Hood had sent them to him in the 

 first instance, and he had put him in communication with Dr. Hudson 

 on the subject. There was just one point which seemed to have been 

 overlooked (though no doubt it had not escaped so careful an observer 

 as Dr. Hudson), and that was as to the length of the antennae, which 

 were quite of a rudimentary character. In Tubicolaria they were very 

 large and conspicuous, but in this new species they were lower down 

 and were quite small, with two little setae on them. 



Mr. Wenham's Note " On a secure Method of Setting the Front 

 Lens of Oil-immersion Objectives," communicated through Mr. Mayall, 

 was read (see p. 121). 



Mr. Stodder's Note on ToUes' Opaque Illuminator for High 

 Powers was read, in which, after referring to Professor Rogers' 

 paper (see vol. iii. p. 754), he writes : — " It is of course a well-known 

 fact that discoveries and inventions are sometimes made by dif- 

 ferent persons simultaneously and independently, and also that such 

 discoveries and inventions are sometimes claimed by a second party, 

 who only acted on a hint or published description by the original dis- 

 coverer. It is for this that priority of publication is always insisted 

 on by scientific men for proof of priority. I will now show that this 

 invention of Tolles was amply published prior to any date mentioned 

 by Professor Eogers, in periodicals not obscure, but of wide circula- 

 tion in Europe and America Professor Eogers refers to the 



'Annual of Scientific Discovery,' Boston, 1866-7, which records the 

 exhibition in 1866. This publication had a wide circulation, and was 

 sufficient publication to establish priority ; but in the ' Monthly Micro- 

 scopical Journal,' London, iii. 1870, p. 49, is a description of the 

 invention under the caption of ' Tolles' new Method of the Illumina- 

 tion of Opaque Objects under High Powers,' giving a description of 

 the invention and its performance. This is credited by the London 

 Journal to ' Dental Cosmos,' as copied from ' Boston Journal of 

 Chemistry,' November 1869, p. 52, 20,000 copies in circulation. 

 Moreover, it was advertised in the catalogue of Tolles' instruments, 

 and taken out only because he found them unprofitable to make. 



" Here are publications of the invention in four scientific perio- 

 dicals, amply sufficient to secure the original inventor bis priority. 



