SCHEDULE 13D/A
NAME OF ISSUER: METRA BIOSYSTEMS
TITLE OF CLASS OF SECURITIES: COMMON STOCK
CUSIP NUMBER: 59114210
NAME, ADDRESS AND TELEPHONE NO: KURT AMUNDSON, 265 NORTH WHISMAN
ROAD,
MOUNTAIN VIEW, CA 94043 PH: 415-903-9100
DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT: 4/13/98
1. NAME OF REPORTING PERSONS: IRS: ID NOS. OF ABOVE PERSON:
THOMAS MITCHELL & CO. LP - 13-3603667
2. CHECK BOX IF A MEMBER OF A GROUP (B) x
3. SEC use only
4. Source of Funds 00
5. Check if Disclosure of Legal Proceedings is Require Pursuant
to Items
2(d) or 2 (e) not sure - no proceedings.
6. Citizenship or Place of Organization - State of Delaware
7. Sole Voting Power - Thomas Mitchell & Co. LP - 192,000
8. Shared Voting Power -
9. Sole Dispositive Power - Thomas Mitchell & Co. LP- 192,000
10. Shared Dispositive Power
11. Aggregate Amount Beneficially Owned by Each Reporting Person
192,000
12. Check if the Aggregate Amount in Row (11) Excludes Certain
Shares
13. Percent of Class Represented by Amount in Row (11) 1.52%
14. Type of Reporting Person
Thomas Mitchell & Co. LP -PN
CUSIP NO: 59114210
SCHEDULE 13D/A
ITEM #1- METRA BIOSYSTEMS
ITEM #2-a- Thomas Mitchell & Co., L.P.
b- POB 31
Lake Placid, NY 12946
C- Limited Partnership
D- During the last five years, Thomas Mitchell & Co.,
LP has not been
convicted in a criminal proceeding .
E- During the last five years, Thomas Mitchell & Co., LP
was not a
party to a civil proceeding of a judicial or
administrative body of
competent jurisdiction and as a result of such
proceeding was or is
subject to a judgment, decree or final order
enjoining future viola
tions of, or prohibiting or mandating activities
subject to,
federal or state securities laws or finding any
violation with
respect to such laws.
F- U.S.A.
ITEM #3- Cash held in account
ITEM #4- For Investment Purposes only.
ITEM #5a- 192,000 / 12,650,000 = 1.52%
b-Thomas Mitchell & Co., LP-sole dispositive power and
sole voting
power
c-20,000-shares purchased to settle 4/13/98 through
NASDAQ and in
negotiated transactions at prices from $2.25 -$2.30
per share.
d-not applicable
e-not applicable
ITEM #6- not applicable
ITEM #7- not applicable
After reasonable inquiry and to the best of my knowledge and
belief, I
certify that the information set forth in this statement is
true,
complete and correct.
Date: April 23, 1998
Signature THOMAS S. MITCHELL
