The results on the deep low dispersion (1250 ${AA}$/mm at $H_r, $30^{circ}$ < I < $165^{circ}$, $195^{circ}$ < I < $210^{circ}$, [b] < $5^{circ}$; 7000${AA}$/mm at A band, $50^{circ}$ < I < $115^{circ}$, b=$0^{circ}$, b=${pm}3.5^{circ}$) spectral surveys of the MILKY WAY are presented. More than 2250 carbon stars were identified among them 1440 new ones. The C/M5+ ratio increases from 0.02 to 0.3 when longitude varies from $30^{circ}$ to $210^{circ}$. On the basis of A GENERAL CATALOG OF GALACTIC COOL CARBON STARS the surface distribution of carbon stars has been studied.