92 PROCEEDINGS OF THE SOCIETY. 



unless possibilities were found of making the source and the diaphragms 

 through which the rays passed exceedingly small smaller than was 

 possililc in practice — the useful magnification would, in his opinion, 

 always be a very restricted one. Be thought, therefore, that no ad- 

 vantage would be gained by pressing that method beyond very 

 moderate magnifications, but the field of interest of the method was. 

 without that, large enough, as all would realize who had been there 

 that evening and had seen Mr. Barnard's remarkable results. 



Mr. Maurice Blood asked a few technical questions, particularly 

 whether the anode was connected up with the anti-cathode, and also 

 their respective functions; and, further, whether it might be possible 

 to get magnification by the pinhole camera if there were a very strong 

 source of X-rays \ At present, as he understood it. parallel rays were 

 used naturally, giving a " life-size " image, but if it were possible to 

 use a pin-hole this would he an alternative possible method of getting 

 magnification. 



Mr. Cheshire said he did not propose to speak at any length, because 

 Mr. Barnard's paper had opened out such a vast range of possibilities, 

 that it would be useless to enter upon them at the present time, but 

 there was one point in connexion with the slides he would like to ask 

 about. As he understood Mr. Barnard., his methods so far necessitated 

 taking the natural size of the object ; he supposed that all further 

 magnification had to be done photographically from the negative in the 

 ordinary way. He would also like to know whether, in Mr. Barnard's 

 opinion, so far as he had foreshadowed it, his method could be applied to 

 the photographing of protoplasmic structures in the way the Chairman 

 had indicated ? 



Dr. Shillington Scales asked wdiat was the equivalent spark-gap of 

 the tube with which the photographs were taken ? To which question. 

 Mr. Barnard replied, one inch. Dr. Scales then said he thought Mr. 

 Barnard's lecture had been extraordinarily interesting, though he had 

 been unable to follow his flights so far into the future, and personally 

 he could not see how his hopes were to be realized, though he agreed 

 that in his paper and demonstrations Mr. Barnard had shown that many 

 possibilities were opened up by his method. He had been rather sur- 

 prised to find Mr. Barnard had any doubt that the granulations in his 

 skiagrams were actually in the Foraminifera, He thought it was hardly 

 possible that they should have been in the plates or screen ; they were 

 so manifestly due to the granules in the Foraminifera themselves that he 

 would have thought that no doubt could have arisen. 



Dr. G. H. Rodman, Past-President of the Rontgen Society, said that 

 as a visitor he would like to tender his thanks for the opportunity of 

 listening to Mr. Barnard. It had been a particular pleasure to renew 

 his acquaintance with this room, where he had at one time attended 

 so many discussions on the theory and use of the X-rays when it was 

 the home of the Rontgen Society. He had always watched with 

 interest the progress made in connexion with this particular branch of 

 science. He had been induced to come to the Meeting that evening 

 from reading in the ' Morning Post ' a notice that Mr. Barnard was 

 speaking on X-rays and microscopy, and as a practical worker in both 



