FILE NO. 333-68747
                                                                  RULE 424(B)(3)


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<S>                                                              <C>
PROSPECTUS SUPPLEMENT NO. 1872                                    MARKET-MAKING TRANSACTIONS
TO (A) FOR THE MEDIUM TERM NOTES (NO SERIES DESIGNATED) THE
PROSPECTUS DATED MAY 6, 1999, AND (B) FOR THE MEDIUM TERM NOTES
(SERIES B) PROSPECTUS AND PROSPECTUS SUPPLEMENT
DATED MAY 6, 1999.


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                           MERRILL LYNCH & CO., INC.
                    MEDIUM-TERM NOTES (NO SERIES DESIGNATED)
                          MEDIUM-TERM NOTES (SERIES B)

     This Prospectus is used by Merrill Lynch, Pierce, Fenner & Smith
Incorporated ("MLPF&S"), a wholly owned subsidiary of Merrill Lynch & Co., Inc.
("ML&Co."), in connection with offers and sales related to market-making
transactions in the Medium-Term Notes (no series designated) and Medium-Term
Notes (Series B) of ML & Co., Inc. in which transactions MLPF&S acts as a
principal. Such sales will be made at prices related to prevailing market prices
at the time of sale.
     As of June 25, 1999, Medium-Term Notes (no series designated) and
Medium-Term Notes (Series B) of the Company have been issued and are currently
outstanding as follows:

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<S>                                        <C>

    From 9 Months but less than 12 Months             N/A


    From 12 Months but less than 18 Months     5.0125% to 5.72%


    From 18 Months but less than 2 Years              N/A


    From 2 Years but less than 3 Years          5.31% to 6.45%


    From 3 Years but less than 4 Years          5.71% to 6.62%


    From 4 Years but less than 5 Years          5.64% to 6.52%


    From 5 Years but less than 6 Years          5.50% to 7.09%


    From 6 Years but less than 7 Years               6.18%


    From 7 Years but less than 10 Years              6.00%


    10 Years or more                            6.05% to 8.13%


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    This reflects actual interest rates for fixed rate Medium-Term Notes (no
   series designated) and Medium-Term Notes (Series B). MLPF&S may also act as
   an agent for its customers in connection with other secondary market
   transactions in the Medium-Term Notes (no series designated) and Medium-Term
   Notes (Series B).

    The Company also has outstanding a variety of floating rate Medium-Term
   Notes (no series designated) and Medium-Term Notes (Series B), the interest
   rates of which are reset periodically depending on various indices. In
   addition, the Company has outstanding Medium-Term Notes (Series B) the return
   on which is correlated to changes in the market price of various equity
   securities or the level of various published indices, or baskets thereof, as
   the case may be.


Dated July 1, 1999