worth writing home about! Now, if you'll stop listening a minute and struggle out of that chair, I'll take you round the boat. She's pretty filthy still, but we'll get her clean again by to-morrow." [1] The date the speaker deals with is before the general use of the hydrophones in submarines.--KLAXON. II ANTI-SUBMARINE WORK I Before speaking of anti-submarine work, a very short description of the German submarine and its variations in type is advisable. A U-boat is not unlike our ordinary patrol-type submarine. She varies in size and capabilities, but is generally a 16-knot (surface speed) boat, with two guns--a 4·1-inch and a 22-pdr., two bow and two stern torpedo-tubes, and about 800 tons surface displacement. A U-B boat is a small patrol boat of about 500 tons surface displacement; one 4·1-inch or 22-pdr. gun, one stern and four bow torpedo-tubes, 13 knots surface speed. There is also a "Flanders," type U-B class, of 250 tons and 8-1/2 knots speed. The latter class worked from Ostend and Zeebrugge. A U-C boat is about 400 tons; one 22-pdr. gun, 12 knots speed, one stern and two bow torpedo-tubes. The Flanders type U-C's are of 180 tons and 7-1/2 knots speed. All U-C's are primarily fitted for mine-laying. The U cruisers are from 2000 to 3000 tons displacement, carry two 5·9-inch guns, have a speed of 16 knots, and in some cases are fitted as mine-layers in addition to their torpedo equipment. The number of slight divergencies from the main types is considerable. Boats were built in standardised groups, and, during the second half of the war, in great quantities. On November 11th, 1918, the position was, roughly, as follows: 200 submarines in German hands, commissioned or completing--135 (roughly) on the building slips. About 200 had been destroyed up to that date. In 1918 the average number of German submarines at sea--in the Adriatic, Irish Sea, Channel, and North Sea--was (in the spring) 20, in October, 24. The number available for service--excluding Mediterranean boats, school boats, and boats out of date--was about 72; so that, roughly, one-third were kept at sea, and the remainder resting or repairing.