1 ABSTRACT CHVÁTALOVÁ, Daniela: Contract of Sale in Private Law. [Dissertation thesis]. Charles University. Faculty of Law; Department of Civil Law. Tutor: prof. JUDr. Jan Dvořák, CSc., Head of Department of Civil Law, Vice-Dean for the Doctoral Study Programme and Rigorosum Procedure. Level of professional qualification: Ph.D., Praha: PF UK, 2015. Key words: Civil Code No. 40/1964 Sb. Commercial Code No. 53/1991 Sb. Civil Code No. 89/2012 Sb. Principles of civil law. Purchase. Dual regulation. Precontracting negotiations. Offer and acceptance of the offer. Contract of sale. Purchase of personal property. Purchase of real property. Subject of the contract. Superficies solo cedit. Construction is a part of the land. Hardship clause. Purchase price and manner for determining the purchase price. Commercial terms and conditions. Decrease in a purchase price. Unreasonable decrease in the purchase price Laesio enormis. Price clause. Delivery of goods. Seller's delay in delivery of goods. Transfer of title. Rights in case of defective performance. Quality, quantity, type, and package. Rebus sic stantibus clause. Contractual penalty. Cancellation of a contract of sale. Sale of a plant. Advance payment and retainer. Supranational projects. Draft Common Frame of Reference (DCFR). Principles of European Contract Law...