There are also facts pointing to the use in German shells of other irritant substances, though in some cases at least these agents are not of the same brutally barbarous character as the gas used in the attack on the Canadians. The effects are not those of any of the ordinary products of combustion of explosives. On this point the symptoms described left not the slightest doubt in my mind. Professor H.B. Baker, F.R.S., who accompanied me, is making further inquiries from the chemical side. I am, my Lord, your obedient servant, J.S. HALDANE. _The following announcement was issued by the British War Office on April 29, 1915:_ Thanks to the magnificent response already made to the appeal in the press for respirators for the troops, the War Office is in a position to announce that no further respirators need be made. THE "EYEWITNESS" STORY. _The following descriptive account was communicated by the British Official Eyewitness present with General Headquarters, supplementing his continuous narrative of the movements of the British force and the French armies in immediate touch with it:_ April 27, 1915. Since the last summary there has been a sudden development in the situation on our front, and very heavy fighting has taken place to the north and northeast of Ypres, which can be said to have assumed the importance of a second battle for that town. With the aid of a method of warfare up to now never employed by nations sufficiently civilized to consider themselves bound by international agreements solemnly ratified by themselves, and favored by the atmospheric conditions, the Germans have put into effect an attack which they had evidently contemplated and prepared for some time. Before the battle began our line in this quarter ran from the cross-roads at Broodseinde, east of Zonnebeke on the Ypres-Moorslede Road to the cross-roads half a mile north of St. Julien, on the Ypres-Poelcapelle Road, roughly following the crest of what is known as the Grafenstafel Ridge. The French prolonged the line west of the Ypres-Poelcapelle Road, whence their trenches ran around the north of Langemarck to Steenstraate on the Yperlee Canal. The area covered by the initial attack is that between the canal and the Ypres-Poelcapelle Road, though it was afterward extended to the west of the canal and to the east of the road.