1682. A weather book is very useful, and may be either of the folio or quarto size, with columns, as under: ï¿½ There is a very good model of this description, called the Naturalist's Kalendar, by the Honourable Daines Barrington, in quarto, which may be procured and filled up. Indeed, every apprentice ought to be made to keep such a calendar, for the sake of inducing habits of observation. It has been judiciously remarked (Farm. Mag., 1820) that, in all calendars of nature, particular attention should be paid to the inflorescence of aquatics, as these are much more regular in their times of foliation and flowering than land plants. The comparative denseness of the medium in which they live prevents their being affected by winds or rains, and probably also by electrical and other atmospherical changes.