354 MR. J. W. GREGORY ON THE 



suggested, that the limestones may be inclusions in the intrusive 

 gneisses. 13ut, at any rate, the rock itself is post-Laurentian and is 

 now included by Messrs. Selwyn* and Vennor in the Iluroniau, while 

 the bands of crystalline calcite to which it owes its fame may have 

 been formed at any time between the cleavage of the rock and the 

 discovery of the specimen by the officers of the Canadian Geological 

 Survey. 



EXPLANATION OF FIGURES. 



Fig. 1. The lower part of the Tudor specimen ; nat. size. The part in the upper 

 portion of the lelt-liand side of the specimen shows the unweathered 

 surface of the slab with the lines of structure (regarded as bedding- 

 planes). To the right of this is the weathered surface containing the 

 white ' Eozoonal ' bands (b); the latter are seen to interrupt the bedding- 

 planes (as at the lower h), to be developed along them (as at d), or to 

 terminate abruptly against them (as at e). This can best be seen when 

 the specimen is moistened. 



Fig. 2. Section transverse to the 'Eozoonal' bands along the right-hand margin 

 of fig. 1 ; x2 diam. In the lower part the schistosity is recognizable, 

 but in the layer containing the ' Eozoonal ' bands it has been obli- 

 terated ; the general form of the ' Eozoonal ' bands in cross-section is 

 shown (but see fig. 3) ; one of the bands is continued across the 

 specimen along a crack. 



Fig. 3. One of the ' Eozoonal' bands of the same slide as fig. 2 (x30 diam., 

 reduced f), showing their relations to the weathered calc-mica-schist ; 

 b is one of the ' Eozoonal ' bands, and b' b' are parts of the two next 

 bands; they show the irregularity of the junction of the crystalline 

 calcite with the rock, parts of the latter projecting into the former; 

 in places the cleavage of the calcite is continued across the inclusions 

 of the rock (as at a). In addition to the particles of graphite (g), 

 the matrix contains crystals of mica (m), but the foliation has been 

 obliterated. 



Fig. 4. Another part of the same slide, showing above the weathered surface 

 with the ' Eozoonal ' bands, and below the normal calc-mica-schist. One 

 of the ' Eozoonal ' bands (6) is continued down across the slide (6'), and 

 in places (as b^) branches along the planes of schistosity. 



Discussion. 



Mr. Sherboen remarked that the Society must be congratulated 

 on having at last the Tudor specimen upon the table. It was for- 

 tunate, too, that the specimen had been examined by Mr. Gregory. 

 He agreed with Professor Moebius that the Tudor specimen had 

 nothing whatever to do with the Eozoonal structure, beyond the 

 fact that both had somewhat parallel layers of calcite. He had no 

 hesitation in saying that, had Dr. AV. B, Carpenter seen the Tudor 

 specimen at the time of the publication of the first account of it, he 

 could not have put his name to the statements. 



The President regretted that no palaeontologist was present to 

 break a lance in support of the organic origin of Eozoon. He had 



* R. A. C. Sclwyn, 'Report of Observations on the Stratigraphy of the 

 Quebec Group,' Rep. Progress Geol, Surv. Canada, lft77-78 (Montreal, 1871)), 

 p. 14 A, 



