Find the surface generated by the solutions of \[ \frac {dx}{yz} = \frac {dy}{zx} = \frac{dz}{xy}, \] which intersects the circle $y^2+ z^2 = 1, x = 0.$

1. Given the differential equation:
   \[
   \frac{dx}{yz} = \frac{dy}{zx} = \frac{dz}{xy},
   \]
   we can set each ratio equal to a common variable, say \( k \). Thus, we have:
   \[
   \frac{dx}{yz} = k, \quad \frac{dy}{zx} = k, \quad \frac{dz}{xy} = k.
   \]

2. From the first equation, we get:
   \[
   dx = k yz.
   \]
   Integrating both sides with respect to \( x \), we get:
   \[
   x = \int k yz \, dx.
   \]
   Similarly, from the second equation:
   \[
   dy = k zx,
   \]
   and integrating both sides with respect to \( y \), we get:
   \[
   y = \int k zx \, dy.
   \]
   And from the third equation:
   \[
   dz = k xy,
   \]
   integrating both sides with respect to \( z \), we get:
   \[
   z = \int k xy \, dz.
   \]

3. To find the characteristics, we can use the fact that:
   \[
   x dx = y dy = z dz.
   \]
   Integrating these, we get:
   \[
   \frac{x^2}{2} = \frac{y^2}{2} + C_1 \quad \text{and} \quad \frac{y^2}{2} = \frac{z^2}{2} + C_2,
   \]
   which simplifies to:
   \[
   x^2 - y^2 = C_1 \quad \text{and} \quad y^2 - z^2 = C_2.
   \]

4. The given circle is \( y^2 + z^2 = 1 \) and \( x = 0 \). Substituting \( x = 0 \) into the characteristics, we get:
   \[
   0 - y^2 = C_1 \quad \Rightarrow \quad C_1 = -y^2.
   \]
   And from the second characteristic:
   \[
   y^2 - z^2 = C_2.
   \]

5. On the circle \( y^2 + z^2 = 1 \), let \( y = s \) and \( z = \pm \sqrt{1 - s^2} \). Substituting these into the characteristics, we get:
   \[
   C_1 = -s^2,
   \]
   and
   \[
   s^2 - (1 - s^2) = C_2 \quad \Rightarrow \quad s^2 - 1 + s^2 = C_2 \quad \Rightarrow \quad 2s^2 - 1 = C_2.
   \]

6. Eliminating \( s \) from the equations, we get:
   \[
   x^2 - y^2 = -s^2,
   \]
   and
   \[
   y^2 - z^2 = 2s^2 - 1.
   \]

7. Combining these, we get:
   \[
   x^2 - y^2 + y^2 - z^2 = -s^2 + 2s^2 - 1 \quad \Rightarrow \quad x^2 - z^2 = s^2 - 1.
   \]

8. Since \( s^2 = y^2 \), we substitute \( s^2 \) back into the equation:
   \[
   x^2 - z^2 = y^2 - 1.
   \]

9. Rearranging, we get the surface equation:
   \[
   2x^2 - y^2 - z^2 + 1 = 0 \quad \Rightarrow \quad y^2 + z^2 = 1 + 2x^2.
   \]

The final answer is \(\boxed{y^2 + z^2 = 1 + 2x^2}\).