When Marey saw Muybridge's photographs he
immediately sent letter to the pages of La Nature
asking Muybridge if he would try his hand at
photographing the flight of birds, but Marey himself
did nothing further with photography. Instead, he
continued his work on muscle fatigue, using a new
myograph, and undertook a new set of cardiological
experiments. In the fall of 1881 Marey saw the
publication of his
La circulation du sang à l'état physiologique et dans
les maladies, his 750 pages summary of this
work. In September Muybridge arrived in Paris and
was feted by Marey who had invited scientists and
artists to meet the photographer. But Marey saw
Muybridge’s results, he was disappointed.
Muybridge's horses tripped the camera shutters by
breaking wires along the path of their movement and
birds couldn't be made to do this. Muybridge used
multiple cameras to capture the shape of a subject’s
body at isolated - and quite far apart - phases of
its motion. Marey wanted to have what his graphing
machines had provided: the visible expression of a
continuous passage of time over equidistant and
known intervals within a single tracing.