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said. “He was quite a contrast to Ralph. Full of vanity and self-regard, and not nearly so intelligent, though he has some smattering of an education, and, as I understand it, a crude grasp of his brother’s accomplishments. Tarquin squandered his own inheritance in trying to follow his father’s footsteps in Southern Africa, failed roundly, and came home pursued by debtors. Eventually his brother took him on as a species of senior assistant. Tarquin acquired equipment for Ralph’s experiments, arranged apparatus and so forth. But even in this he proved less than competent, and Ralph was forced to demote him, effectively, to work as subordinate to Ralph’s own engineer, a stolid local chap called Bryson.”

I remarked, “It looked as if your lunch party took place in the midst of Ralph’s apparatus.”

“Yes.” Wells smiled. “He was fond of such spectaculars. And I must describe the purpose of that apparatus to you, for it will be of significance to your investigation.

“I have mentioned Ralph’s attempts – partially successful, he claimed – to nullify gravity. But this proved possible only over a small volume. To extend his abilities – to build greater ships which might carry teams of men across the Void of Space – Ralph pursued studies of more subtle aspects of the gravitational phenomenon, notably the Equivalence between Intertial and Gravitational Mass. You see – ”

I held up my hands. “I cannot speak for Holmes, but I am already baffled, Mr Wells. I know nothing of gravity, save for its slow dragging at the lower spines and arches of my patients.”

“Let me explain by analogy. Mr Holmes, can I trouble you for some coins? A sovereign and a farthing should do – there. Thank you.” He held the two coins over the carriage floor. “Look here, Watson. The sovereign is considerably heavier than the farthing.”

“That is clear enough.”

“If I release these coins simultaneously they will fall to the floor.”

“Of course.”

“But which will arrive first? – the farthing, or the sovereign?”

Holmes looked amused. I felt that embarrassed frustration which sometimes comes over me when I cannot follow some elaborated chain of reasoning. And yet, the case seemed simple enough. “The sovereign,” I said. “Disregarding the resistance of the air, as the heavier of the two – ”

Wells released the coins. They fell side by side, and struck the carriage floor together.

“I am no expert in Gravitational Mechanics,” Holmes chided me, “but I do remember my Galileo, Watson.”

Wells retrieved the coins. “It is all to do with various Laws of Newton. Under gravity, all objects fall at the same rate, regardless of their mass. Think of it this way, Watson: if you were in a lift, and the cable snapped, you and the lift would fall together. You would feel as if you were floating, inside the lift car.”

“Briefly,” I said, “until the shaft floor was reached.”

“Indeed. It was precisely this effect which Ralph strove to study. In the luncheon chamber I showed you, with an apparatus of coils and cones and loops, he managed to create a region of space in which – as Ralph showed us with a series of demonstrations and tricks – thanks to the adjustment of the gravity field with electrical energy, heavier objects did indeed fall more rapidly than the lighter! This was the ‘Inertial Adjustor’, as Ralph called it. It sounds a trivial feat – and is much less spectacular than shooting a capsule at the moon – but it is nonetheless quite remarkable. If true.”

“But you doubt it,” Holmes said. “In fact, you employed the word ‘tricks’.”

Wells sighed. “Dear old Ralph. I do not think he lied deliberately. But his optimism and energy for his own work would sometimes cloud his critical judgement. And yet the acceptance of his theories and devices – particularly his Inertial Adjustor – were central to his life, his very mental state.”

“So central, in fact, that they led to his death.”

“Indeed,” said Wells. “For it was in that very chamber, within the Intertial Adjustor itself, that Ralph Brimicombe died – or was killed!”

It was after three o’clock when at last we reached Chippenham. We