Honk your horn with **L3**, or even better, bribe the police chief, steal a police car, and turn on the siren with **L3**.

While playing, hold the **L3** button and press Circle, Circle, Square, Square, X, Triangle, then Triangle.

The exact fulfilment of this condition requires the solution of a transcendental equation; but it may be fulfilled with accuracy sufficient for practical purposes by using, instead of (32 B) the following approximate equation: L nearly = 2C +ir(ri +ri) + (Ti rz)2/c. (~**l3**)

To Kolliker,ll Gegenbaur, 12 and more recently Spenger, **l3** amongst German anatomists, we are indebted for epoch-making researches of the same kind.

L i =objective, L2 **L3** = eyepiece of the Ramsden type.

- A one-one relation between the members of two classes a and 0 is any method of correlating all the members of a to all the members of 13, so that any member of a has one and only one correlate in 1 3, and any member of **l3** has one and only one correlate in a.

This suggests that we should write; la as a l **l3**; and we find that the use of fractional indices in this way satisfies the laws of integral indices.

72 with arcs of the length 1,, l2, **l3**, &c., and with the radii r1, r 2, &c. (note, for a length 2l 1 at each end the radius will be infinite, and the curve must end with a straight line tangent to the last arc), then let v be the measured deflection of this curve from the straight line, and V the actual deflection of the bridge; we have V = av/b, approximately.