Pavel Jacobi tried to introduce theories of Karl Marx, he married Varvara Alexandrovna and served as a military doctor.
He also tried to introduce theories of Karl Marx into the field of forensic medicine. In Switzerland he married Varvara Alexandrovna Zaytseva, sister of Russian publicist Varfolomey Zaytsev (18421882). In 1871 during the Franco-Prussian War Jacobi served as a military doctor in the Army of the Vosges led by Giuseppe Garibaldi. 
