FT 1900 – ‘487’ on 12/31/08 – EX-99.2A

On:  Wednesday, 12/31/08, at 2:31pm ET   ·   Effective:  12/31/08   ·   Accession #:  1445546-8-1007   ·   File #:  333-153812

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Pre-Effective Pricing Amendment
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 487         Form S-6 to Effective Amendment                      206±   869K 
 2: EX-99       Memorandum of Changes                                  1      6K 
 4: EX-99.2A    Opinion Regarding Legality                             2±     8K 
 3: EX-99.A1    Trust Agreement                                       49±   180K 
 7: EX-99.C2    Consent of Evaluator                                   1      6K 
 5: EX-99.C4A   Opinion Regarding Federal Tax Status                   4±    17K 
 6: EX-99.C4B   Opinion Regarding New York Tax Status                  2±     9K 
 8: EX-99.C4C   Opinion Regarding U.K. Tax Status                      6±    20K 

EX-99.2A   —   Opinion Regarding Legality

CHAPMAN AND CUTLER LLP                
111 WEST MONROE STREET                
CHICAGO, ILLINOIS  60603                

December 31, 2008               

First Trust Portfolios L.P.                                                     
120 East Liberty Drive, Suite 400                                               
Wheaton, Illinois  60187                                                        

Re:                        FT 1900                                    

Gentlemen:                                                                      

We  have served as counsel for First Trust Portfolios  L.P.,          
as  Sponsor  and  Depositor of FT 1900  in  connection  with  the               
preparation,  execution and delivery of a Trust  Agreement  dated               
December   31,  2008  among  First  Trust  Portfolios  L.P.,   as               
Depositor,  The Bank of New York Mellon, as Trustee  First  Trust               
Advisors  L.P.  as  Evaluator and Portfolio Supervisor,  and  FTP               
Services LLC, as FTPS Unit Servicing Agent, pursuant to which the               
Depositor has delivered to and deposited the Securities listed in               
Schedule  A to the Trust Agreement with the Trustee and  pursuant               
to  which  the  Trustee has issued to or  on  the  order  of  the               
Depositor  a  certificate or certificates representing  units  of               
fractional  undivided  interest in  and  ownership  of  the  Fund               
created under said Trust Agreement.                                             

In  connection  therewith, we have examined  such  pertinent          
records  and  documents  and matters of law  as  we  have  deemed               
necessary  in  order  to  enable  us  to  express  the   opinions               
hereinafter set forth.                                                          

Based upon the foregoing, we are of the opinion that:                 

1.   the  execution and delivery of the Trust Agreement  and          
the  execution and issuance of certificates evidencing the  Units               
in the Fund have been duly authorized; and                                      

2.   the certificates evidencing the Units in the Fund  when          
duly  executed and delivered by the Depositor and the Trustee  in               
accordance   with   the  aforementioned  Trust  Agreement,   will               
constitute  valid  and binding obligations of the  Fund  and  the               
Depositor  in accordance with the terms thereof and  such  Units,               
when issued and delivered in accordance  with the Trust Agreement               
against  payment  of  the consideration set forth  in  the  Trust               
prospectus,  will  be  validly  issued,  fully  paid   and   non-               
assessable.                                                                     

We  hereby  consent  to the filing of  this  opinion  as  an          
exhibit  to  the  Registration Statement  (File  No.  333-153812)               
relating  to the Units referred to above, to the use of our  name               
and  to  the reference to our firm in said Registration Statement               
and in the related Prospectus.                                                  

           Respectfully submitted,

          CHAPMAN AND CUTLER LLP

EFF:arr                                                                         

Dates Referenced Herein

This ‘487’ Filing		Date		Other Filings
Filed on / Effective on:		12/31/08		None on these Dates
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