The case of Lockhart v. Johnson in 1900 revolved around a dispute over land ownership and inheritance laws. The plaintiff, Lockhart, claimed that he was the rightful owner of certain lands in Mississippi based on an alleged will from his deceased relative, while the defendant, Johnson, argued that she had inherited the same lands as per state law since there was no valid will present at the time of death. The Supreme Court ruled in favor of Johnson stating that under Mississippi law at that time period (the late 19th century), if a person died without leaving a valid will behind then their property would be distributed among their closest relatives according to state succession laws rather than any verbal or unwritten agreements made prior to death. This ruling reinforced legal principles regarding probate and estate distribution when there is no written testamentary document available.

The dissenting opinion in the case of Lockhart v. Johnson, 1900 is not available or does not exist. This could be due to several reasons such as all justices agreeing on the decision (unanimous decision), no written dissent by any justice, or historical records being incomplete or lost for this particular case from over a century ago. It's also possible that this specific case may have been decided without full Supreme Court review, thus lacking a formal dissenting opinion.