. Polytechnic Association Proceedings. 557 



Dr. Vanderweyde spoke strongly in favor of the invention, but 

 denied both the latter positions taken by the inventor, as to its 

 value in beer and petroleum barrels. 



TEE MICROSCOPE. 

 Dr. Vanderweyde exhibited an improved microscope, and insisted 

 on its immense value to the chemist in discovering, by means of 

 polarized light, the presence of certain organic substances which 

 could not be detected with the spectroscope. He explained the 

 method of taking microscopic photographs, and showed some pic- 

 tures of mtozoa. He mentioned numerous objections to the 

 binocular microscope, and gave many interesting facts touching 

 the use of the most improved forms of microscopes which had 

 been brought to great perfection by American makers of objectives. 

 After which, the Association adjourned to next Monday evening. 



Addendum. 

 We give below a description of the proposed Broadway Under- 

 ground railway, which was presented before this Association by 

 Samuel Nolan, on the 28th day of February last. {Seejp. 830 of 

 the volume of Transactions for 1866-7.) The engraving of the 

 plan was not furnished in time to be inserted in that volume, and 

 will now be found at the commencement of the report for this year: 



THE PROPOSED BROADWAY ARCADE RAILWAY. 



The rapid gi'owth of New York city in wealth and population, 

 with the corresponding increase in trade and travel, have so crowded 

 the thoroughfares and overburdened the means of transportation, 

 that the imperative demand for relief has naturally awakened the 

 active thoughts and creative faculties of many minds. Among the 

 numerous plans presented, apparently the most complete and com- 

 prehensive is that of the "Arcade railway," projected by Hon. 

 Melville C. Smith and H. C. Gardiner, Esq. 



The plan has been received with general favor by the public and 

 by engineers. Of the latter. Gen. E. L. Viel6, Hon. William J. 

 McAlpine, C. L. McAlpine, Gen. C. B. Stuart, Gen. I. F. Quimby, 

 Gen. D. C. McCallum, Col. J. W. Adams, Silas Seymour, W. H. 

 Green and D. E. and I. B. Culver, among others, have given it their 

 hearty indorsement. 



On another page is an illustration taken from a view near Wall 

 -Street, looking up Broadway. 



