 Complete the following phrase:  A pet project of his was the Buenos Aires Botanical Garden, for which he petitioned the city government to set aside land almost 8 hectares, which he designed in sections to display plants organised by continent, with a large section devoted to the native plants of Argentina, which were ignored in garden-making at the time. The garden has the first Ginkgo biloba planted in Argentina. Completed in 1898, it bears his name, the Jardín Botánico Carlos Thays de la Ciudad Autónoma de Buenos Aires. One greenhouse, was first erected at the 