Excerpt: ...and dry periods near Nice, within the previous five or six months; they weighed 9.5 oz., or 5 lb. 5.5 oz. per square yard. After an interval of four months, Dr. King collected all the castings subsequently ejected on the same square foot of surface, and they weighed 2.5 oz., or 1 lb. 6.5 oz. per square yard. Therefore within about ten ...
Excerpt: ...and dry periods near Nice, within the previous five or six months; they weighed 9.5 oz., or 5 lb. 5.5 oz. per square yard. After an interval of four months, Dr. King collected all the castings subsequently ejected on the same square foot of surface, and they weighed 2.5 oz., or 1 lb. 6.5 oz. per square yard. Therefore within about ten months, or we will say for safety's sake within a year, 12 oz. of castings were thrown up on this one square foot, or 6.75 pounds on the square yard; and this would give 14.58 tons per acre. In a field at the bottom of a valley in the chalk (see No. 2 in the foregoing table), a square yard was measured at a spot where very large castings abounded; they appeared, however, almost equally numerous in a few other places. These castings, which retained perfectly their vermiform shape, were collected; and they weighed when partially dried, 1 lb. 13.5 oz. This field had been rolled with a heavy agricultural roller fifty-two days before, and this would certainly have flattened every single casting on the land. The weather had been very dry for two or three weeks before the day of collection, so that not one casting appeared fresh or had been recently ejected. We may therefore assume that those which were weighed had been ejected within, we will say, forty days from the time when the field was rolled, -that is, twelve days short of the whole intervening period. I had examined the same part of the field shortly before it was rolled, and it then abounded with fresh castings. Worms do not work in dry weather during the summer, or in winter during severe frosts. If we assume that they work for only half the year-though this is too low an estimate-then the worms in this field would eject during the year, 8.387 pounds per square yard; or 18.12 tons per acre, assuming the whole surface to be equally productive in castings. In the foregoing cases some of the necessary data had to be estimated, but in the two following cases the...
Fair. Darwin, Charles. The Formation of Vegetable Mould through the Action of Worms with Observations on Their Habits. NY: D. Appleton, 1896. 386pp. Illustrated. 8vo. Book condition: Fair with an inch missing from head of backstrip and rubbed and bumped edges. An ex-library copy with white call numbers over black paint on foot of backstrip and a few old library marks and attachments on endsheets. Internally clean and tightly bound.
Good. New York, 1898. Three quarter red leather with marbled boards; edges and covers worn, heavier at corners and spine ends; top edge gilt; 12mo, 6 3/4" to 7 3/4" tall; no jacket. Interior is clean and unmarked; 326 pages.
Fair. No dustjacket. Published by John Murray, 1904, this copy has foxing to the edges and some pages (around a quarter), fraying to the bottom of the spine, tanned endpapers with cracked hinges at both and bumped corners to the edge of the rubbed green cloth cover. However, as a reading copy of an early edition, this is perfectly acceptable, with firm binding within, and a reasonably sound cover. The text and plates are complete. 298pp.
Good+ 1885 edition. Orange-red cloth covers. There is some darkening to the spine and some small chips to the cloth at the edges of the spine. The corners are worn through at the edges and slightly bumped. The hinges are typed in the text block is sound. The pages are clean. Overall a solid copy.; 326 pages.
Good+ with no dust jacket. No dust jacket. Rubbing and shelfwear to boards. Loose Binding. 2/3 of spine cover missing. Pages tanned, a few pages torn; Leather spine and corners, marbled boards: wear to covers, otherwise text block clean and solid; 1896; 8vo 8"-9" tall; 326 pages.
Good. Good hardcover. No DJ. ORIGINAL 1892 EDITION. ILLUSTRATED. Pages are clean and unmarked, though tanned. Covers show light edge wear. Binding is tight, hinges strong.; 100% Satisfaction Guaranteed! Ships same or next business day!
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