Nor should it be thought that Russian history was merely a topic to fill out his course, indeed he wrote a serious scientific thesis on the owning of property in Novgorod in the 15th and 16th centuries.
At hindi dapat ito ma-iisip na Ruso ay kasaysayan lamang ng isang paksa upang punan ang kanyang kurso, sa katunayan siya wrote isang pang-agham serious tesis sa ang pagmamay-ari ng mga ari-arian sa Novgorod sa ika-15 at ika-16 sandaang.