"what Is This That Roareth Thus?..."

[robert551069]

Could you please help me by finishing the poem which starts as follows:-
"What is this that roareth thus?
Can it be a motor bus?
Yes, the noise and hideous hum
Indicat motorem bum...."
(I remember that it featured in a Latin primer at school long ago)

[jno]

What is this that roareth thus?
Can it be a Motor Bus?
Yes, the smell and hideous hum
Indicat Motorem Bum!
Implet in the Corn and High
Terror me Motoris Bi:
Bo Motori clamitabo
Ne Motore caedar a Bo---
Dative be or Ablative
So thou only let us live:---
Whither shall thy victims flee?
Spare us, spare us, Motor Be!
Thus I sang; and still anigh
Came in hordes Motores Bi,
Et complebat omne forum
Copia Motorum Borum.
How shall wretches live like us
Cincti Bis Motoribus?
Domine, defende nos
Contra hos Motores Bos!

[robert551069]

Thank you, jno, for your prompt and helpful answer

[seadogg]

Only know;

See Willy, see ergo
Fortibus is inero.