250 



Photographs, intending to make a few remarks upon them, but he was not 

 aware at the time that Dr. Woodward was going to present copies also to the 

 Club. These photographs were taken by Dr. Woodward's new process, and were 

 very interesting proofs of his success. Some time ago, from difficulties which 

 he met with, he had given up the use of sunlight, and had made use of the 

 electric light and magnesium instead ; but he had lately been trying sunlight 

 again, and had at length overcome all his difficulties. When Mr. Beck was in 

 America, he gave to Dr. Woodward a Podura scale, which he said was the finest 

 he had ever seen, and of this Dr. Woodward had taken two photographs, one of 

 which was perfectly in focus, and the other, by a slight alteration, showed to 

 some extent the beaded structure described by Dr. Pigott, and about which 

 there had lately been so much controversy. He held himself that these beads 

 were illusions, but that the exclamation marks were not. Dr. Maddox thought 

 that the whole of the appearances, including the exclamation markings, were 

 optical illusions, and Mr. Wenham called the exclamation marks disjointed ribs, 

 to which term he objected, because it supposed the existence of joints. There 

 was another scale of great interest to persons who took up the subject, that of 

 the speckled podura. By the use of a little apparatus of Mr. Wenham's inven- 

 tion, consisting of a little truncated lens placed below the slide, when properly 

 adjusted, a very beautiful dark ground illumination is obtained, and the scale 

 is seen to shine in a black field with remarkable clearness. Dr. Woodward had 

 photographed the podura scales shown in this manner, and these might be con- 

 sidered, perhaps, the most wonderful pictures he bad ever taken, because of the 

 great difficulty which attended it. He hoped to be able to bring his microscope 

 and show the scales in this manner; the effect was very striking, the exclama- 

 tion markings seeming quite to stand up. He believed fully that the beads 

 about which so much had been said, were only illusions and ghosts. 



The Chairman,' in thanking Mr. McTntire for his communication, observed 

 that no one had worked more at the subject, and that due weight would, no 

 doubt, be given to his opinions. 



Mr. Eichards exhibited to the meeting a new rackwork erector, which he de- 

 scribed as being a considerable improvement upon those commonly in use. 

 Nothing particularly new was found in the results produced, but his arrange- 

 ment was a different and improved method of obtaining those results. 



The Secretary read a letter from Mr. Jackson, relative to the omission of Dr 

 Barker's name in connection with the immersion paraboloid, to which subject 

 reference had been made at the preceding meeting. 



The usual conversazione concluded the proceedings, at which the following 

 objects were exhibited :— 



Trachea of the Larva of Dytiscus by Mr. Hainworth. 



Mermis Nigrescens Mr. R. T. Lewis. 



Artemis Salina— in early stage and in ") Mr> R p Williams. 



maturity ) 



Argulus foliaceus, alive ) Mr GeQ< wil]iamB . 



Daphnia Pulex, alive J 



