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An innitesimal derivative of the Bott class is dened by gen- eralizing Heitsch'es construction. We prove a formula relating the innites- imal derivative to the Schwarzian derivatives, which gives a generalization of the Maszczyk formula for the Godbillon-Vey class of real codimension- one foliations. As an application, a residue of innitesimal derivatives with respect to the Julia set in the sense of Ghys, Gomez-Mont and Saludes is introduced.

Infinitesimal derivative of the Bott class and the Schwarzian derivatives