228 



out removing any portion from the stage, whilst the whole 

 fitting could be removed from the ring whenever this was 

 desired. 



Mr. Karop inquired what was the weight of this combination 

 fitting. The object of it was, no doubt, a very useful one, to 

 avoid the trouble and time usually required in changing the 

 apparatus when fitted into the substage in the ordinary way ; 

 but he thought the difficulty here, as in some other cases, would 

 be to get the stops as near as was desirable to the lower com- 

 bination of the condenser. 



Mr. Orfeur did not know what the weight of the whole fitting 

 was, but it was in its present form the outcome of several 

 attempts to carry out the dea he had in view. The weight 

 could possibly be reduced if it were found necessary. 



The President thought it was certainly a great advantage to 

 have these things together, especially as regarded the stops, 

 because it would prevent them from being lost or from getting 

 left at home. They were greatly obliged to Mr. Orfeur for 

 bringing the new arrangement to the meeting and showing it to 

 the members. 



The President exhibited another of his series of lenses, a 

 triple achromatic with great working distance, extremely sharp 

 in definition and flat in the field. It was made by Mr. Watson, 

 and was a cemented Steinheil triplet. 



Mr. Karop said it was really a splendid lens, sharp up to the 

 very edge, and certainly one of the very best of the series. 



A paper by Mr. Buff ham was, owing to the unavoidable 

 absence of the author, taken as read. 



Mr. T. C. White exhibited on the screen a large number of 

 photo-micrographs, giving a short explanation of the methods 

 by which they had been taken, and pointing out anything of 

 special interest in each picture as they were somewhat rapidly 

 passed in review. 



The President expressed the hearty thanks of the meeting to 

 Mr. White for bringing down these slides and showing them in 

 such a very beautiful and interesting way, the vote of thanks 

 being carried by acclamation. 



The following objects, etc., were afterwards exhibited. 

 Phimatella repens ... ... ... ... Mr. W. Burton. 



Limnesia fulgida (Koch)... ... ... Mr. C. D. Soar. 



