By the time of his retirement in 1906 he had published some 65 chemical papers, most of them in the Spanish language, on such diverse topics as the chemical compositions of Argentine rivers, the medicinal plants of  Córdoba Province, Argentina, the incrustation of locomotive boilers, the presence of organic matter in drinking water, the caffeine content of yerba mate, the adulteration of saffron, the wines of the Argentine Republic, compositions of meteorites fallen in Buenos Aires Province, Patagonian guano, the petroleum of Jujuy Province, a new alkaloid he isolated from Ruprechtia salicifolia, Cape Virgins gold, Tierra del Fuego platinum, well water, the cement of a failed dam, the destruction of masonry by cloacal gases, and a silver-yielding manganese ore from Mendoza Province.
According to Rapela and Depetris, Kyle was the first Argentine geochemist.  Of his papers,
On a vanadiferous lignite found in the Argentine Republic with analysis of the ash  was read before the British Association Edinburgh meeting in 1892.  His last work, published in Ambrosetti, El bronce en la region calchaquí established that the Calchaquí Amerindians were a Bronze Age people.  He died in Buenos Aires on 23 February 1922.