The phrase "which speculation" is grammatically correct and can be used in written English.
It is commonly used as a relative clause to provide additional information about a specific speculation. Example: The CEO denied the rumors, which speculation had been swirling around the company for weeks.
The declaration came after a day in which speculation about the leadership had been building.
Which parts were pure invention, which speculation and which were based on reliable sources?
This is important, because rising stocks are the channel through which speculation in futures markets affects the spot price.
Information sharing among allies sometimes produces an information loop in which speculation just keeps getting passed on, he said.
In a field in which speculation is an ever-present seduction, Professor Greenewalt was admired by colleagues for his constitutional caution.
Why not have a Medicare Anticipation account in which speculation is used to defray the avalanche of costs reasonably anticipated by Medicare?
These new and previously published results of experiments in which microtubule dynamics was directly modulated with inhibitors are at odds with the speculations that microtubule dynamics as such may be involved in T cell polarization, which speculations find support only in T-cell signaling studies [4], [5].
The traditions offer a structure through which such speculation is ordered and clarified.
Incidentally, it was also Bill Clinton who, in 1999, repealed the Glass-Steagall Act of 1933, which prevented speculation by banks.
But that followed a set of speeches and public appearances in New Hampshire, which encouraged speculation that he is.
Two investors, Michael F. Price and James J. Cramer, demanded that the company do something about Telerate, which caused speculation that they might also attempt a takeover.
