656 TRANSACTIONS OF THE 



side, that the rays of light passing by the opaque lines are dis- 

 persed, and a blurred and indistinct impression would be received, 

 instead of the clear, sharp one he desired, and that he always 

 aims to press the paper as closely against the collodion as possi- 

 ble in order to produce the proper effect. I say, therefore, that 

 it is vain to expect a sharp enlarged picture from a negative by 

 transmitted light, however perfect the lenses may be figured ; 

 while by reflection, an ordinary lens will, with the exception of 

 spherical aberration, produce a clear, well defined picture. By 

 the method Mr. Moore employs, positive collodion pictures, 

 daguerreotypes, engravings, and all pictures, are alike eligible, 

 whether opaque or transparent ; while by the usual method a 

 very dense negative on glass is the only kind that can be enlarged, 

 and even then, much light will pass through the silver film and 

 assist in destroying the distinctness of the resulting picture. 



The form of apparatus which was invented by Mr. Moore, over 

 eleven years ago, has been constantly used by him ever since, 

 and also by several of his personal friends in the same profession, 

 to whom Mr. Moore, with a liberality worthy of imitation, gave 

 the plans; and by his permission the door is now thrown open to 

 the public, with the hope that he has contributed one Moore stone 

 to the building of this magnificent structure. 



I am aware that the evening is devoted to the discussion of 

 another subject, and will not, therefore, longer consume time nor 

 tax your patience. I feel an interest in this art, for the degree 

 of perfection and usefulness it has already attained are truly 

 wonderful. But I assure you that the various developments that 

 have followed each other in such rapid succession, and that have 

 excited in the world so much astonishment and admiration, are 

 but as the tinted leaves that surround the opening bud, whose 

 higher colors and greater perfections the warm sunlight of man's 

 genius shall in time unfold. 



W. B. Skellington, of New- York, illustrated by drawings on 

 the black-board, his new plan for relief of Broadway travel. A 

 net work of wrought iron upon a concrete bolted to the present 

 pavement, and to the sides of the street. The iron, perhaps inch 

 size, wrought together in meshes about three inches square, for the 

 hoofs of horses to have firm hold. He said nothing about the wheels. 



