For in situ observation in a 1 MeV TEM Co-Ge liquid alloy ion sources (LAISs) were mounted to a special specimen holder revealing the formation of the field-stabilized Co-Ge liquid alloy cone, the change in the tip shape as a function of the ion emission current, spatial shifts of the liquid alloy cone, and microdroplet emission from Co-Ge LAISs. This has facilitated the better understanding of the ion and microdroplet emission process from Co-Ge LAISs in a large range of ion current. Below the onset voltage the shape of the tip covered with the liquid Co-Ge alloy is spherical. At the onset voltage the Taylor cone is formed. A jetlike protrusion at the cone vertex may or may not exist. At higher ion emission currents there is a jetlike protrusion at the Taylor cone vertex. The cone half-angle ct decreases and the jet length I increases with increasing emission current I,. Linear dependences of Lu and I on I, are found. Emission of microdroplets is observed at the shanks behind the Taylor cone. The radius of microdroplets varied between 0.035 and 10 mu m. These microdroplets are emitted in time intervals of about 0.1 s and more.