1G2 



niently used as a monocular, as the secondary body was quite out of 

 the way, and the whole of the light was shut off from the slot that the 

 prism had previously occupied. The rackwork was of great length, so that 

 it would take in a 4 or even a 5 inch objective, the extremely thin stage was 

 an advantage in oblique illumination, and it was provided with a very con- 

 venient holder for the slides. Countersunk in the stage was a little rotating 

 cell, in which a selenite, or a slide of diatoms, could be placed and concen- 

 trically rotated. The box contained, in addition to the microscope, a variety 

 of apparatus, including one of Mr. Swift's achromatic condensers, and anew 

 pattern nose piece, with the arm curved. The polarizing apparatus was also 

 worthy of note, because the analyzing prism was placed ready in the tube 

 above the binocular prism, an arrangement which was of advantage in the 

 use of polarized light with the binocular. 



The President thought the instrument and its arrangements were admi- 

 rable ; an important point was certainly that of placing the analyzing prism 

 immediately above the reflecting prism, so that it could be used binocularly ; 

 and another to which he also drew attention, was the method of focussing 

 the condenser by means of an inclined slot and pin. 



A paper by Mr. Henry Davis, entitled " Notes on a Larval Cirripede," 

 was read by Mr. Curties, who expressed his regret at the unavoidable 

 absence of the author. The paper was illustrated by diagrams, and by 

 specimens exhibited in the room. 



The President said he need not say that any investigator who drew atten- 

 tion to larval forms, and prevented them from being referred to new genera, 

 did good service to the student. It was something new to him to hear of a 

 parasitic Cirripede. 



The thanks of the meeting were unanimously voted to Mr. Davis for his 

 paper, and to Mr. Curties for communicating it. 



Mr. Hammond read a paper " On a Comparison between the Metamor. 

 phosis of the Crane Ply and the Blow Fly," the subject being illustrated by 

 a series of excellent coloured diagrams. 



The President said he must confess that the subject was one which he had 

 by no means studied ; he could therefore only express his pleasure at the 

 amount of labour and delicacy which had been bestowed upon such investi- 

 gations as those, in going over the ground so well worked by Mr. Lowne 

 and others, not only confirming, but also, in some measure, going beyond 

 them. 



Mr. T. C. White thought that the paper they had just heard with so much 

 pleasure, would reflect credit, not only upon Mr. Hammond, but also upon 

 the Club itself ; for it could not fail to be creditable to the Club to have 

 such a paper printed in its proceedings. He hoped that the impression pro- 

 duced by this paper would not be allowed to die away, for there was no 

 study more interesting, or more likely to be productive of good results, than 

 the study of larval forms and their development. He should like to ask Mr. 

 Hammond where and when these larvae were to be obtained ? He was 

 himself only a tyro in entomology, and therefore desired information, and 

 thought it quite possible that many of the younger members of the Club 



