46 THE ALUMNI JOURNAL. 



things they will do if they see no neces- taining coins showed only the coins and 

 sity for doing them, and few things they the metallic clasp. This remarkable re- 

 will not do (and do well) when the neces- suit is accounted for on the theory that 

 sity arises. lyike the steeds of the Arabs the strange medium which produces im- 

 they will only walk or gallop, but it may ages of hidden objects on a photograph 

 well be that their tendency to walk when plate is not light at all. It is equally 

 opportunity offers provides a reserve incorrect to describe it as electricity. It 

 force for the galloping, and may enable is some force or influence produced by 

 them to get more enjoyment out of life, Crooke's tube when excited in a peculiar 

 and yet to accomplish as much as is done manner, but it is not the visible light or 

 by the constant plodding of the Britisher, glow which comes from the tube. That 

 or the ceaseless energy of the American, visible light has the same qualities as an 

 — Ai7ier. Drug. & Pharm. Record. ordinary light. The invisible new me- 



• ■ dium has not the same qualities. For 



THE WONDERS OF PHOTOGRAPHY. instance, it will not penetrate clear glass. 



Electricity and photography are the It will penetrate ground glass, though 



two fields in which everything is to be more feebly than wood or other organic 



expected and nothing astonishes. Where matter. Aluminum is far more trans- 



the two are combined we have indeed to parent than glass. Kven copper is less 



expect marvels. The kinetoscope, tho' opaque than glass. 



in a sense little more than a toy, is an Mr. Swinton, the London electrical en- 

 evidence of the wonders to be expected gineer, exhibited a large collection o 

 from electricity and photography work- these strange photographs at the Camera 

 ing together, and a still more remark- Club. Reemployed a half horse-power 

 able result than that shown in the electric current, and passing it through 

 kinetoscope has been accomplished by an induction coil, loaded ten lyCy den jars. 

 Professor Rontgen, of the University of The discharge from them was passed 

 Wurzburg, Germany. through a second induction coil by a 

 So far the report rests upon newspaper secondary system by which Crooke's tube 

 authority, but the original reports have was excited. He said that he had only 

 been so generally confirmed as to lead to succeeded in this way, and had failed 

 their acceptance as being correct. More- with Crooke's tubes excited by an ordi- 

 over, the experiments have been repeated nary induction coil. 



with brilliant success at the London An almost equally remarkable discov- 



Camera Club. The negatives are pro- ery is reported by W. Inglis Rogers, in 



duced by placing the object to be pho- the Amateur Photographer of November 



tographed between a Crooke tube and a 22. Mr. Rogers asserts that he has been 



wooden plate holder containing an ordi- able to photograph the retinal image of 



nary sensitive plate, exciting the tube an object. His first experiment was done 



by means of a secondary induced current alone; the second was in the presence of 



of electricity for from 4 to 20 minutes and three other men, one being a physician, 



then developing the negative in the usual A small object, in one case a shilling, in 



manner. The slide is not removed from the other a postage stamp, was placed in 



the plate holder. good light before the writer, who gazed 



A negative thus made from the living fixedly at it for one minute; the light was 



hand shows only the bones of the hand, then shut off, and the test object replaced 



while the negative of a leather purse con- by a rapid photographic plate, at which 



