- Manning, Cardinal
- Marseilles
- Masters and men
- Mattress press, hydraulic
- Maudslay, Henry
- Maudslay, Henry
- his factory
- private workshop
- maxims
- uniformity of screws
- block-machinery
- the Endeavour
- screw-tackle
- philosophy of construction
- the 'Lord Chancellor'
- friends
- return from Berlin
- proposed telescope
- death
- Merrick, S. V.,
- Microscope, investigations with
- Milky Way
- Miller, Hugh, on boulder clay
- Miller, Patrick
- Mint, Royal
- Mitchell, Sir T.,