260 PROCEEDINGS OF THE SOCIETY. 



The Chairman said that the Council had given their consideration to 

 the suggestion made at the last Meeting with regard to giving early 

 notice to the Fellows as to what would take place at the succeeding 

 Meeting, and had decided to accede to the proposal, by arranging that if 

 those Fellows who were desirous of receiving the information monthly 

 would send stamped envelopes to the Assistant Secretary, addressed to 

 themselves, he would send them as much information as he possessed at 

 the time of posting. It was not always possible to say beforehand all 

 that would come before the Meeting, as it often happened that interest- 

 ing exhibits' or short notes were- only sent in at the last moment. It 

 was assumed that only a small number of the Fellows would need to have 

 this information sent to them, but in any case the experiment would be 

 tried. 



i Mr.- Vezey said it might be well to remind the Fellows that announce- 

 ments of the subjects for the Meetings, as far as known, were made in 

 several of the daily and weekly papers. 



The following Objects, Instruments, etc., were exhibited : — 



Messrs. C. Baker : — A New Portable Microscope. 



Mr. C. L. Curties, for Mr. H. J. Waddington : — Protozoa : Acinetas,]). 

 .(Marine), Xoctiluca miliar is. Ccelenterata : Cladonema radiatum, Oono- 

 thyrcm sp., Tar r is sp. Polyzoa : \Bowerban1cia sp., Pedicellina sp., 

 Lopltopus erystallinus. Crustacea : Gaprella erethizon, Mysis sp., show- 

 ing otocysts and pigment. Tunicata : Perophera Listen'. 



Dr. R. G. Hebb : — Two woodcuts in illustration of Mr. Nelson's 

 paper ' On the Influence of the Antipoint on the Microscopic Image 

 shown Graphically.' 



Mr. Peter Heele : — A Direct- Vision Spectroscope incase, and a larger 

 form on stand. 



Mr. Keith Lucas : — Nine Lantern Slides, in illustration of his paper 

 4 On a Microscope with Geometric Slides ' ; a model illustrating the 

 principle of the geometric slide ; and a Microscope as described in his 

 paper. 



Mr. C. F. Rousselet : — Statoblasts of Freshwater Polyzoon, Pectina- 

 . tell a magnified, (Leidy). 



Mr. E. B. Stringer : — A Direct-vision Spectroscope with an attach- 

 ment for reading the lines of the Spectrum. 



New Fellows. — The following were elected Ordinary Fellows : — 

 Messrs W. Griffiths and F. A. Mason. 



Prof. J. D. Everett writes us as follows : — 



I regret to find that the letter e has been omitted in lines ?> and 5 

 of page 27 of the February Number, in which my paper appeared. 

 The omission is so obvious that I cannot think how I overlooked it in 

 correcting the proof. The correct formulas are : 



2 77 • , 2 7T . ■ , • s 



€ sin a and — — e (sin a -J- sin y) 



