This volume presents a collection of six linguistic studies focusing on Philippine languages done by pioneer Filipino linguists. Consuelo J. Paz examines the dialectal landscape of Rizal, aiming to identify distinct dialects and create a dialect atlas and further analyzes phonological variations within the region. Ernesto A. Constantino explores syntactic and semantic aspects of verbal root words in Filipino and investigates subject, predicate, and focus markers in the Isinay language. Viveca V. Hernández contributes two comparative studies: one on the development of medial consonant clusters in Philippine languages and another on pluralization processes in Tagalog, Cebuano, Bikol, and Ilocano. Together, these studies offer valuable insights into the phonological, morphological, and syntactic structures of Philippine languages, enhancing our understanding of their development and classification.