The text in the rule book states that Spirits of Man have the power:
Innate Spell (any one spell known by the summoner; Force is limited to the spirit's Magic)
The question is whether spells taken as Alchemical Preparations count as "spells known by the summoner". I feel that the answer is probably yes, due to the fact that it still refers to "spells" when describing the process of creating Alchemy, and also this line in the "Choose a Spell" section of the Alchemy rules:
Spells used in preparations are different versions of the Sorcery spells listed on p. 283, but have the same effect, Drain Value, keywords, and so on as those spells. You learn the alchemical versions of these spells separately from Sorcery spells, but the Karma cost is the same.
Are there any definitions of what constitutes a "Spell" for this purpose, or other rules that clarify the situation?