In the case of Colvin v. Jacksonville (1894), the United States Supreme Court ruled on a dispute involving taxation and property rights. The city of Jacksonville, Florida had imposed taxes on railroad properties owned by William G. Colvin within its jurisdiction, which he refused to pay arguing that his properties were exempt from local taxation under an 1869 state law granting tax immunity to railroads for a period of fifteen years from their construction date. However, this law was repealed in 1872 but it wasn't clear whether the repeal applied retroactively or not. The court held that even if there was ambiguity about whether the repealing act applied retrospectively or not, it should be interpreted as having prospective effect only unless express terms indicate otherwise - thus upholding Mr.Colvin's claim for exemption based on initial grant until expiry of said term i.e., fifteen years post-construction date. This decision reinforced principles related to interpretation of statutes especially those dealing with tax exemptions and reaffirmed protection against retrospective operation without explicit legislative intent.

The dissenting opinion in the case of Colvin v. Jacksonville argued that the city's decision to issue bonds for a private corporation was unconstitutional, as it violated Florida state law prohibiting municipalities from becoming stockholders in any company or association. The justice contended that this action constituted an illegal loan of public credit to a private enterprise and therefore should not be upheld by the court. He further asserted that such actions could lead to corruption and misuse of public funds, undermining trust in government institutions. Despite these concerns, however, he acknowledged that his interpretation did not align with majority opinion on what constitutes 'public purpose', which allowed for more flexibility regarding municipal involvement in commercial enterprises.