152 THE ESSEX NATURALIST Cypress. There are many species and types of cypress that add colour and variety to the Essex countryside, but the two most important ones are undoubtedly the Monterey cypress (Cupressus macrocarpa) and Lawson's cypress (C. Lawsoniana). The former excels by the seaside, standing salt spray and gales, and in sheltered places will grow up to 60 feet in height. It is a very quick grower, increasing in height by over a yard per year. Lawson's cypress is, with all its varieties, the most popular conifer for gardens. Considering the first tree was not introduced into England until 1854, it is amazing how many fine trees of this species are to be found in the county, and specimens up to 50 feet high are quite frequently seen. TREE PRESERVATION ORDERS The County of Essex was one of the first local authorities to realise the importance of retaining some of the best trees which we have inherited from the past, and in 1932 the Essex County Council Act was passed so that outstanding trees growing in private gardens, parklands, copse or wood- land can be preserved for the benefit of all. From 1933 until the present day, 1,247 trees have been preserved under this Act. In many cases they were registered in order to save them from being felled, whilst in other cases they were registered as being outstanding specimens of their type or ideally situated from an amenity aspect. Trees registered in this way include not only ash, oak, beech and pine, but also the more ornamental types such as horse chestnut, cedar and cypress, and in addition there are quite a number of the more unusual trees, which include Liriodendron, Taxodium distichum, Wellingtonia, Alnus glutinosa im- perialis, etc. Short-lived trees such as silver birch and small ornamental trees such as cherry and crab, have not, as a rule, been included, and the trees must be at least three feet in girth and 30 feet high before they are registered. These rules have, in many cases, emphasised the retention of very large mature and over-mature trees, whilst young saplings with a potentially much longer life growing nearby have been ignored. The trees, when registered, cannot be